Randomized trial of questionnaire length.
Rothman KJ, Mikkelsen EM, Riis A, Sørensen HT, Wise LA, Hatch EE.
Rothman KJ, et al. Among authors: mikkelsen em.
Epidemiology. 2009 Jan;20(1):154. doi: 10.1097/EDE.0b013e31818f2e96.
Epidemiology. 2009.
PMID: 19234404
Clinical Trial.
No abstract available.