Effect of Recruitment Methods on Response Rate in a Web-Based Study for Primary Care Physicians: Factorial Randomized Controlled Trial.
Ryuhei SoKiyomi ShinoharaTakuya AokiYasushi TsujimotoAya M SuganumaToshiaki A FurawakaPublished in: Journal of medical Internet research (2018)
University Hospital Medical Information Network Clinical Trials Registry UMIN000025317; https://upload.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000029121 (Archived by WebCite at http://www.webcitation. org/6wOo1jl9t).