Mobile Phone Ownership Is Not a Serious Barrier to Participation in Studies: Descriptive Study.
Emily J HarveyLeslie F RubinSabrina L SmileyYitong ZhouHoda ElmasryJennifer L PearsonPublished in: JMIR mHealth and uHealth (2018)
ClinicalTrials.gov NCT02261363; https://clinicaltrials.gov/ct2/show/NCT02261363 (Archived by WebCite at http://www.webcitation.org/6wOmDluSt).