Harden, S; Beauchamp, M; Pitts, B; Nault, E; Davy, B; You, W; Weiss, P; Estabrooks, P. Group-based lifestyle sessions for gestational weight gain management: a mixed method approach. American Journal of Health Behavior. 2014 Jul;38(4):560-9. doi: 10.5993/AJHB.38.4.9.