Provision of pen along with questionnaire does not increase the response rate to a postal survey: a randomised controlled trial.
Clark
T J
TJ
Academic Department of Obstetrics and Gynaecology, Birmingham Women's Hospital, Birmingham B15 2TG, UK. T.J.Clark@bham.ac.uk
Khan
K S
KS
Gupta
J K
JK
D003253:Consultants; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D009042:Motivation; D011795:Surveys and Questionnaires / Q000592:standards*