@article{Norris2007,
author = {Norris, S.A. and Richter, L.M. and Fleetwood, S.A. },
title= {Panel studies in developing countries: Case analysis of sample attrition over the past 16 years within the Birth to Twenty cohort in Johannesburg, South Africa},
year = {2007},
doi = {10.1002/jid.1390},
journal = {Journal of International Development },
volume = {19},
number = {8},
pages = {1143--1150},
}