1. School of Medicine Chung Shan Medical University Taichung Taiwan
2. Rheumazentrum Ruhrgebiet Herne Germany
3. Ruhr Universität Bochum Bochum Germany
4. Center for Global Health, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of Epidemiology Harvard T.H. Chan School of Public Health Boston Massachusetts USA
6. Division of Pharmacoepidemiology and Pharmacoeconomics Department of Medicine, Brigham and Women's Hospital, Harvard Medical School Boston Massachusetts USA