Does recruitment source moderate treatment effectiveness? A subgroup analysis from the EVIDENT study, a randomised controlled trial of an internet intervention for depressive symptoms.
Jan-Philipp KleinCarla GamonChristina SpäthThomas BergerBjörn MeyerFritz HohagenMartin HautzingerWolfgang LutzEik VettorazziSteffen MoritzJohanna SchröderPublished in: BMJ open (2017)
ClinicalTrials.gov NCT01636752.