Publisher
- public health sciences division, fred hutchinson cancer research center, wa, seattle, united states44
- department of medicine and epidemiology, university of pittsburgh medical center, pa, pittsburgh, united states43
- division of clinical epidemiology and aging research, german cancer research center (dkfz), heidelberg, germany42
- american medical association37
- oxford university press35
- springer-verlag34
- nature publishing group uk33
- springer33
- elsevier ltd32