Oral microflora in preschool children attending a fluoride varnish program: a cross-sectional study.
Maria AndersonMargaret GrindefjordGöran DahllöfGunnar DahlénSvante TwetmanPublished in: BMC oral health (2016)
www.controlled-trials.com (ISRCTN35086887) 20131216 'retrospectively registered'.