Using WhatsApp and Facebook Online Social Groups for Smoking Relapse Prevention for Recent Quitters: A Pilot Pragmatic Cluster Randomized Controlled Trial.
Derek Yee Tak CheungChing Han Helen ChanChi-Keung Jonah LaiWai Fung Vivian ChanMan-Ping WangHo Cheung William LiSophia Siu Chee ChanTai Hing LamPublished in: Journal of medical Internet research (2015)
Clinicaltrials.gov NCT02007369; https://clinicaltrials.gov/show/NCT02007369 (Archived by WebCite® at http://www.webcitation.org/6c3RbltQG).