About the Authors
Medical Research Council Epidemiology Unit, Cambridge, United Kingdom
Department of Paediatrics, University of Cambridge, Cambridge, United Kingdom
Department of Social Medicine, University of Bristol, United Kingdom
Childhood Nutrition Research Centre, Institute of Child Health, London, United Kingdom
National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, United States of America
Department of Community Based Medicine, University of Bristol, United Kingdom
The authors have declared that no competing interests exist.
KKO, CR and DBD contributed to the original hypothesis. KKO, CR, ARN, JG and DBD contributed to the study design. ARN and JG oversaw the fieldwork and acquisition of the data. KKO and KN performed data management and statistical analyses. All authors contributed to interpretation of the data and writing the paper.