aDepartment of Endocrinology and Diabetes, Royal Brisbane and Women's Hospital

bSchool of Medicine

cPopulation Health Department, QIMR Berghofer Medical Research Institute, Queensland

dSchool of Public Health, The University of Queensland, Australia

Correspondence to Susan J. Jordan, MBBS, PhD, School of Public Health, The University of Queensland, Brisbane, Queensland, Australia. Tel: +61 7 3365 5473; e-mail: [email protected]