Autor: |
Hesketh KR; Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina; Population, Policy and Practice, UCL Institute of Child Health, London, United Kingdom. Electronic address: kathryn.hesketh@ucl.ac.uk., Evenson KR; Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina; Center for Health Promotion and Disease Prevention, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina. |