@article{Langhaug2010,
author = {Langhaug, L.F. and Sherr, L. and Cowan, F.M.},
title= {How to improve the validity of sexual behaviour reporting: Systematic review of questionnaire delivery modes in developing countries},
year = {2010},
doi = {10.1111/j.1365-3156.2009.02464.x},
volume = {15},
number = {3},
pages = {362--381},
}