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.