Jonathan C K Wells (Jonathan Ck Wells, Jonathan K Wells, J C K Wells, Jonathan Wells, Jonathan C Wells, Jonathan C Wells)
Publication Activity (10 Years)
Years Active: 2016-2024
Publications (10 Years): 94
Publications (10 Years): 94
University of Cambridge (PHD)
Education History
University of Cambridge
United Kingdom
Publications
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Jin-Yue Yu, Yan Zhang, Jonathan C K Wells, Zhuang Wei, Mona Bajaj-Elliott, Dennis Sandris Nielsen, Mary S Fewtrell
- Adriana Del Pilar Vázquez-Vázquez, Emeline Rougeaux, Sarah Dib, Mary S Fewtrell, Jonathan C K Wells
- Adriana Del Pilar Vázquez-Vázquez, Emeline Rougeaux, Sarah Dib, Mary S Fewtrell, Jonathan C K Wells
- Jin-Yue Yu, Yan Zhang, Jonathan C K Wells, Zhuang Wei, Mona Bajaj-Elliott, Dennis Sandris Nielsen, Mary S Fewtrell
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Akanksha A Marphatia, Laura K Busert, Dharma S Manandhar, Alice M Reid, Cortina-Borja Mario, Naomi M Saville, M Dahal, Mahesh Chandra Puri, Jonathan C K Wells
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Jin-Yue Yu, Yan Zhang, Jonathan C K Wells, Zhuang Wei, Mona Bajaj-Elliott, Dennis Sandris Nielsen, Mary S Fewtrell
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Malgorzata A Desmond, Mary S Fewtrell, Jonathan C K Wells
- Adriana Del Pilar Vázquez-Vázquez, Emeline Rougeaux, Sarah Dib, Mary S Fewtrell, Jonathan C K Wells
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Winok Lapidaire, Alvaro Proaño, Cauane Blumenberg, Christian Loret de Mola, Carlos A Delgado, Darwin Del Castillo, Fernando C Wehrmeister, Helen Denise Gonçalves da Silva, Robert H Gilman, Richard A Oberhelman, Adam J Lewandowski, Jonathan C K Wells, Juan Jaime Miranda
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Debbie S Thompson, Kimberley McKenzie, Charles Opondo, Michael S Boyne, Natasha Lelijveld, Jonathan C K Wells, Tim J Cole, Kenneth Anujuo, Mubarek Abera, Melkamu Berhane Arefayine, Albert Koulman, Stephen A Wootton, Marko Kerac, Asha V Badaloo, null null
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Nicole D S Grunstra, Lia Betti, Barbara Fischer, Martin Haeusler, Mihaela Pavličev, Ekaterina Stansfield, W Trevathan, Nicole M Webb, Jonathan C K Wells, K R Rosenberg, Philipp Mitteroecker
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Debbie S Thompson, Kimberley McKenzie, Charles Opondo, Michael S Boyne, Natasha Lelijveld, Jonathan C K Wells, Tim J Cole, Kenneth Anujuo, Mubarek Abera, Melkamu Berhane Arefayine, Albert Koulman, Stephen A Wootton, Marko Kerac, Asha V Badaloo, null null
- Lopez-Gonzalez Desiree, Jonathan C K Wells, Partida-Gaytan Armando, Cortina-Borja Mario, Clark Patricia
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Mathilde S Heltbech, Cecilie L Jensen, Tsinuel Girma, Mubarek Abera, Bitiya Admassu, Pernille Kæstel, Jonathan C K Wells, Kim F Michaelsen, Henrik Friis, Gregers S Andersen, Rasmus Wibaek
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Fengxiu Ouyang, Jonathan C K Wells, Guang-Hui Zhang, Kun Du, Xia Wang, Lixiao Shen, Zhong-Cheng Luo, Jun Zhang
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Analiza Mónica Silva, Francesco Campa, Silvia Stagi, Luís A Gobbo, Roberto Buffa, Stefania Toselli, Diego Augusto Santos Silva, Ezequiel M Gonçalves, Raquel David Langer, Gil Guerra-Júnior, Dalmo R L Machado, Emi Kondo, Hiroyuki Sagayama, Naomi Omi, Yosuke Yamada, Tsukasa Yoshida, Wataru Fukuda, Maria Cristina González, Silvana P Orlandi, Josely Correa Koury, Tatiana Moro, Antonio Paoli, Salome Kruger, Aletta Elisabeth Schutte, Angela Andreolli, Carrie P Earthman, Vanessa Fuchs-Tarlovsky, Alfredo Irurtia, Jorge Castizo-Olier, Gabriele Mascherini, Cristian Petri, Laura K Busert, Cortina-Borja Mario, Jeanette Bailey, Zachary Tausanovitch, Natasha Lelijveld, Hadeel Ali Ghazzawi, Adam Tawfiq Amawi, Grant M Tinsley, Suvi T Kangas, Cécile Salpéteur, Adriana Vázquez-Vázquez, Mary S Fewtrell, Chiara Ceolin, Giuseppe Sergi, Leigh C Ward, Berit Lilienthal Heitmann, Roberto Fernandes da Costa, German Vicente-Rodriguez, Margherita Micheletti Cremasco, Alessia Moroni, John Shepherd, Jordan Moon, Tzachi Knaan, Manfred J Müller, Wiebke Braun, José M García-Almeida, António L Palmeira, Inês Santos, Sofus C Larsen, Xueying Zhang, John R Speakman, Lindsay D Plank, Boyd A Swinburn, Jude Thaddeus Ssensamba, Keisuke Shiose, Edilson Serpeloni Cyrino, Anja Bosy-Westphal, Steven B Heymsfield, Henry C Lukaski, Luís Bettencourt Sardinha, Jonathan C K Wells, Elisabetta Marini
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Jay T Stock, Emma Pomeroy, Christopher B Ruff, Marielle Brown, Matthew A Gasperetti, Fa-Jun Li, Lisa Maher, Caroline Malone, Veena Mushrif-Tripathy, Eóin Parkinson, Michael Rivera, Yun Ysi Siew, Sofija Stefanović, Simon Stoddart, Gunita Zariņa, Jonathan C K Wells
- Fengxiu Ouyang, Xiaobin Wang, Jonathan C K Wells, Xia Wang, Lixiao Shen, Jun Zhang
- Debbie S Thompson, Kimberley McKenzie, Charles Opondo, Michael S Boyne, Natasha Lelijveld, Jonathan C K Wells, Tim J Cole, Kenneth Anujuo, Mubarek Abera, Melkamu Berhane Arefayine, Albert Koulman, Stephen A Wootton, Marko Kerac, Asha V Badaloo, null null
- Joseph Mbabazi, Hannah Pesu, Rolland Mutumba, Suzanne Filteau, Jack Ivor Lewis, Jonathan C K Wells, Mette Frahm Olsen, André Briend, Kim F Michaelsen, Christian Mølgaard, Christian Ritz, Nicolette Nabukeera-Barungi, Ezekiel Mupere, Henrik Friis, Benedikte Grenov
- Kate Sadler, Philip T James, Zulfiqar Ahmed Bhutta, André Briend, Sheila Isanaka, Andrew N Mertens, Mark Myatt, Kieran Sunanda O'Brien, Patrick Webb, Tanya Khara, Jonathan C K Wells
- Rebecca Rimbach, Yosuke Yamada, Hiroyuki Sagayama, Philip N Ainslie, Lene F Anderson, Liam J Anderson, Lenore Arab, Issaad Baddou, Kweku Bedu-Addo, Ellen E Blaak, Stephane Blanc, Alberto G Bonomi, Carlijn V C Bouten, Pascal Bovet, Maciej S Buchowski, Nancy F Butte, Stefan Gerardus Camps, Graeme L Close, Jamie A Cooper, Sai Krupa Das, Lara R Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W Fudge, Annelies Hc Goris, Michael D Gurven, Catherine Hambly, Asmaa El Hamdouchi, Marije B Hoos, Sumei Hu, Noorjehan Joonas, Annemiek M Joosen, Peter Katzmarzyk, Kitty P Kempen, Misaka Kimura, William E Kraus, Robert F Kushner, Estelle V Lambert, William R Leonard, Nader Lessan, Corby K Martin, Anine Christine Medin, Erwin P Meijer, James C Morehen, James P Morton, Marian L Neuhouser, Theresa A Nicklas, Robert M Ojiambo, Kirsi H Pietiläinen, Yannis P Pitsiladis, Jacob Plange-Rhule, Guy Plasqui, Ross L Prentice, Roberto A Rabinovich, Susan B Racette, David A Raichlen, Eric Ravussin, Rebecca M Reynolds, Susan B Roberts, Albertine J Schuit, Anders M Sjödin, Eric Stice, Samuel S Urlacher, Giulio Valenti, Ludo M Van Etten, Edgar A Van Mil, Jonathan C K Wells, George Wilson, Brian M Wood, Jack A Yanovski, Tsukasa Yoshida, Xueying Zhang, Alexia J Murphy-Alford, Cornelia U Loechl, Amy H Luke, Jennifer C Rood, Dale A Schoeller, Klaas R Westerterp, William W Wong, John R Speakman, Herman Pontzer, null null
- Adriana Del Pilar Vázquez-Vázquez, Mary S Fewtrell, Hidekel Chan-García, Carolina Batún-Marrufo, Federico Dickinson, Jonathan C K Wells
- Marc Rickenbacher, Nejla Gültekin, Zeno Stanga, Nicole Bender, Kaspar Staub, Jonathan C K Wells, Katarina L Matthes, Emile Reber
- Susan Thurstans, Charles Opondo, Andrew Seal, Jonathan C K Wells, Tanya Khara, Carmel Dolan, André Briend, Mark Myatt, Michel Garenne, Andrew Mertens, Rebecca Sear, Marko Kerac
- Meghan K Shirley, Owen J Arthurs, Kiran K Seunarine, Tim J Cole, Simon Eaton, Jane E Williams, Chris A Clark, Jonathan C K Wells
- Yosuke Yamada, Xueying Zhang, Mary E T Henderson, Hiroyuki Sagayama, Herman Pontzer, Daiki Watanabe, Tsukasa Yoshida, Misaka Kimura, Philip N Ainslie, Lene Frost Andersen, Liam J Anderson, Lenore Arab, Issaad Baddou, Kweku Bedu-Addo, Ellen E Blaak, Stephane Blanc, Alberto G Bonomi, Carlijn V C Bouten, Pascal Bovet, Maciej S Buchowski, Nancy F Butte, Stefan Gerardus Camps, Graeme L Close, Jamie A Cooper, Richard S Cooper, Sai Krupa Das, Lara R Dugas, Simon Eaton, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W Fudge, Annelies Hc Goris, Michael D Gurven, Lewis G Halsey, Catherine Hambly, Asmae Elhamdouchi, Marije B Hoos, Sumei Hu, Noorjehan Joonas, Annemiek M Joosen, Peter Todd Katzmarzyk, Kitty P Kempen, William E Kraus, Wantanee Kriengsinyos, Robert F Kushner, Estelle Victoria Lambert, William R Leonard, Nader Lessan, Corby K Martin, Anine Christine Medin, Erwin P Meijer, James C Morehen, James P Morton, Marian L Neuhouser, Theresa A Nicklas, Robert M Ojiambo, Kirsi H Pietiläinen, Yannis P Pitsiladis, Jacob Plange-Rhule, Guy Plasqui, Ross L Prentice, Roberto A Rabinovich, Susan B Racette, David A Raichlen, Eric Ravussin, Leanne M Redman, John Joseph Reilly, Rebecca M Reynolds, Susan B Roberts, Albertine J Schuit, Luis B Sardinha, Analiza Mónica Silva, Anders M Sjödin, Eric Stice, Samuel S Urlacher, Giulio Valenti, Ludo M Van Etten, Edgar G Van Mil, Jonathan C K Wells, George Wilson, Brian M Wood, Jack A Yanovski, Alexia J Murphy-Alford, Cornelia U Loechl, Amy H Luke, Jennifer C Rood, Klaas R Westerterp, William W Wong, Motohiko Miyachi, Dale A Schoeller, John R Speakman, null null
- Kulnipa Kittisakmontri, Julie Lanigan, Jonathan C K Wells, Suphara Manowong, Sujitra Kaewarree, Mary Fewtrell
- Sarah Dib, Jonathan C K Wells, Simon Eaton, Mary Fewtrell
- Maria Hein Hegelund, Daniel Faurholt-Jepsen, Alemseged Abdissa, Daniel Yilma, Åse B Andersen, Dirk L Christensen, Jonathan C K Wells, Henrik Friis, Tsinuel Girma, Mette F Olsen
- Adriana Del Pilar Vázquez-Vázquez, Mary S Fewtrell, Hidekel Chan-García, Carolina Batún-Marrufo, Federico Dickinson, Jonathan C K Wells
- Lopez-Gonzalez Desiree, Jonathan C K Wells, Alicia Parra-Carriedo, Gladys Bilbao, Martín Mendez, Patricia Clark
- Jonathan C K Wells, Akanksha A Marphatia, Dharma S Manandhar, Mario Cortina-Borja, Alice M Reid, Naomi S Saville
- Sarah Dib, Jonathan C K Wells, Simon Eaton, Mary Fewtrell
- Sarah Dib, Jonathan C K Wells, Simon Eaton, Mary Fewtrell
- Sarah Dib, Jonathan C K Wells, Simon Eaton, Mary Fewtrell
- Adriana Del Pilar Vázquez-Vázquez, Mary S Fewtrell, Hidekel Chan-García, Carolina Batún-Marrufo, Federico Dickinson, Jonathan C K Wells
- Adriana Del Pilar Vázquez-Vázquez, Mary S Fewtrell, Hidekel Chan-García, Carolina Batún-Marrufo, Federico Dickinson, Jonathan C K Wells
- Sarah-Louise Decrausaz, Meghan K Shirley, Jay T Stock, Jane E Williams, Mary S Fewtrell, Chris A Clark, Owen J Arthurs, Jonathan C K Wells
- Susan Thurstans, Charles Opondo, Andrew J Seal, Jonathan C K Wells, Tanya Khara, Carmel Dolan, André Briend, Mark Myatt, Michel Garenne, Rebecca Sear, Marko Kerac
- Pacifique Mwene-Batu, Jonathan C K Wells, Ghislain Maheshe, Michel P Hermans, Esther Kalumuna, Gaylord Ngaboyeka, Christine Chimanuka, Victor O Owino, Jean Macq, Melissa Lukula, Michelle Dramaix, Philippe Donnen, Ghislain Bisimwa
- Lotte E Vlug, Esther G Neelis, Jonathan C K Wells, Mary S Fewtrell, Wendy L M Kastelijn, Joanne F Olieman, Minerva J Taeubert, Jorine A Roelants, Dimitris Rizopoulos, René M H Wijnen, Edmond H H M Rings, Barbara A E de Koning, Jessie M Hulst
- Małgorzata A Desmond, Jakub G Sobiecki, Maciej Jaworski, Paweł Płudowski, Jolanta Antoniewicz, Meghan K Shirley, Simon Eaton, Janusz Książyk, Mario Cortina-Borja, Bianca De Stavola, Mary S Fewtrell, Jonathan C K Wells
- Faith A Miller, Akanksha A Marphatia, Jonathan C K Wells, Mario Cortina-Borja, Dharma S Manandhar, Naomi M Saville
- Naomi M Saville, Helen Harris-Fry, Akanksha Marphatia, Alice Reid, Mario Cortina-Borja, Dharma S Manandhar, Jonathan C K Wells
- Jonathan C K Wells, Peter S Davies, Mark Hopkins, John E Blundell
- Jonathan C K Wells, Akanksha A Marphatia, Gabriel Amable, Mario Siervo, Henrik Friis, J Jaime Miranda, Hinke H Haisma, David Raubenheimer
- Daniel P Longman, Sakura Oyama, James Cracknell, Nathan Thompson, Dan Gordon, Jay T Stock, Jonathan C K Wells
- Jonathan C K Wells, Akanksha A Marphatia, Mario Cortina-Borja, Dharma S Manandhar, Alice M Reid, Naomi M SavilleMaternal physical, socioeconomic, and demographic characteristics and childbirth complications in rural lowland Nepal: Applying an evolutionary framework to understand the role of phenotypic plasticity. American journal of human biology : the official journal of the Human Biology Council 33 (6) (2021)
- Klaas R Westerterp, Yosuke Yamada, Hiroyuki Sagayama, Philip N Ainslie, Lene F Andersen, Liam J Anderson, Lenore Arab, Issaad Baddou, Kweku Bedu-Addo, Ellen E Blaak, Stephane Blanc, Alberto G Bonomi, Carlijn V C Bouten, Pascal Bovet, Maciej S Buchowski, Nancy F Butte, Stefan G J A Camps, Graeme L Close, Jamie A Cooper, Sai K Das, Richard Cooper, Lara R Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W Fudge, Annelies H Goris, Michael Gurven, Catherine Hambly, Asmaa El Hamdouchi, Marije B Hoos, Sumei Hu, Noorjehan Joonas, Annemiek M Joosen, Peter Katzmarzyk, Kitty P Kempen, Misaka Kimura, William E Kraus, William E Kraus, Estelle V Lambert, William R Leonard, Nader Lessan, Corby K Martin, Anine C Medin, Erwin P Meijer, James C Morehen, James P Morton, Marian L Neuhouser, Theresa A Nicklas, Robert M Ojiambo, Kirsi H Pietiläinen, Yannis P Pitsiladis, Jacob Plange-Rhule, Guy Plasqui, Ross L Prentice, Roberto A Rabinovich, Susan B Racette, David A Raichlen, Eric Ravussin, Rebecca M Reynolds, Susan B Roberts, Albertine J Schuit, Anders M Sjödin, Eric Stice, Samuel S Urlacher, Giulio Valenti, Ludo M Van Etten, Edgar A Van Mil, Jonathan C K Wells, George Wilson, Brian M Wood, Jack Yanovski, Tsukasa Yoshida, Xueying Zhang, Alexia J Murphy-Alford, Cornelia U Loechl, Amy H Luke, Herman Pontzer, Jennifer Rood, Dale A Schoeller, William W Wong, John R Speakman, null null
- Tatianny de Macêdo Cesário, Paulo Francisco de Almeida-Neto, Dihogo de Matos Gama, Jonathan C K Wells, Felipe J Aidar, Roberto Fernandes da Costa, Breno Guilherme de Araújo Tinoco Cabral
- Herman Pontzer, Yosuke Yamada, Hiroyuki Sagayama, Philip N Ainslie, Lene Frost Andersen, Liam J Anderson, Lenore Arab, Issaad Baddou, Kweku Bedu-Addo, Ellen E Blaak, Stephane Blanc, Alberto G Bonomi, Carlijn V C Bouten, Pascal Bovet, Maciej S Buchowski, Nancy F Butte, Stefan Gerardus Camps, Graeme L Close, Jamie A Cooper, Richard S Cooper, Sai Krupa Das, Lara R Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W Fudge, Annelies Hc Goris, Michael D Gurven, Catherine Hambly, Asmae Elhamdouchi, Marjije B Hoos, Sumei Hu, Noorjehan Joonas, Annemiek M Joosen, Peter Todd Katzmarzyk, Kitty P Kempen, Misaka Kimura, William E Kraus, Robert F Kushner, Estelle Victoria Lambert, William R Leonard, Nader Lessan, Corby K Martin, Anine Christine Medin, Erwin P Meijer, James C Morehen, James P Morton, Marian L Neuhouser, Theresa A Nicklas, Robert M Ojiambo, Kirsi H Pietiläinen, Yannis P Pitsiladis, Jacob Plange-Rhule, Guy Plasqui, Ross L Prentice, Roberto A Rabinovich, Susan B Racette, David A Raichlen, Eric Ravussin, Rebecca M Reynolds, Susan B Roberts, Albertine J Schuit, Anders M Sjödin, Eric Stice, Samuel S Urlacher, Giulio Valenti, Ludo M Van Etten, Edgar G Van Mil, Jonathan C K Wells, George Wilson, Brian M Wood, Jack A Yanovski, Tsukasa Yoshida, Xueying Zhang, Alexia J Murphy-Alford, Cornelia U Loechl, Amy H Luke, Jennifer C Rood, Dale A Schoeller, Klaas R Westerterp, William W Wong, John R Speakman, null null
- Gerard Bryan Gonzales, Natasha Lelijveld, Celine Bourdon, Emmanuel Chimwezi, Moffat J Nyirenda, Jonathan C K Wells, Marko Kerac, Robert H J Bandsma
- Kulnipa Kittisakmontri, Julie Lanigan, Jonathan C K Wells, Mary S Fewtrell
- Akanksha A Marphatia, Naomi M Saville, Dharma S Manandhar, Mario Cortina-Borja, Alice M Reid, Jonathan C K Wells
- Rasmus Wibaek, Dorte Vistisen, Tsinuel Girma, Bitiya Admassu, Mubarek Abera, Alemseged Abdissa, Marit Eika Jorgensen, Pernille Kæstel, Kim F Michaelsen, Henrik Friis, Jonathan C K Wells, Gregers Stig Andersen
- Jonathan C K Wells, Mark A Saunders, Adam S Lea, Mario Cortina-Borja, Meghan K Shirley
- Christian Fabiansen, Charles W Yaméogo, Ann-Sophie Iuel-Brockdorf, Bernardette Cichon, Maren Johanne Heilskov Rytter, Anura Kurpad, Jonathan C K Wells, Christian Ritz, Per Ashorn, Suzanne Filteau, André Briend, Susan Shepherd, Vibeke B Christensen, Kim F Michaelsen, Henrik Friis