@article{Wellings2013,
author = {Wellings, K. and Jones, K.G. and Mercer, C.H. and Tanton, C. and Clifton, S. and Datta, J. and Copas, A.J. and Erens, B. and Gibson, L.J. and Macdowall, W. and Sonnenberg, P. and Phelps, A. and Johnson, A.M.},
title= {The prevalence of unplanned pregnancy and associated factors in Britain: Findings from the third National Survey of Sexual Attitudes and Lifestyles (Natsal-3},
year = {2013},
doi = {10.1016/S0140-6736(13)62071-1},
volume = {382},
number = {9907},
pages = {1807--1816},
}