Trajectories of 12-Month Usage Patterns for Two Smoking Cessation Websites: Exploring How Users Engage Over Time.
Jonathan B BrickerVasundhara SridharanYifan ZhuKristin E MullJaimee L HeffnerNoreen L WatsonJennifer B McClureChong-Zhi DiPublished in: Journal of medical Internet research (2018)
ClinicalTrials.gov NCT01812278; https://www.clinicaltrials.gov/ct2/show/NCT01812278 (Archived by WebCite at http://www.webcitation.org/6yPO2OIKR).