1. School of Public Health Brown University Providence RI U.S.A
2. Institute for Clinical and Economic Review Boston MA U.S.A
3. Unit for Population‐Based Dermatology Research St John's Institute of Dermatology Guy's & St Thomas’ NHS Foundation Trust and King's College London London U.K
4. Division of Dermatology Department of Medicine University of Toronto Toronto Canada
5. Department of Medicine and Women's College Research Institute Women's College Hospital Toronto Canada