1. Division of Hematology-Oncology; Department of Internal Medicine; Chang Gung Memorial Hospital at Linkou; Chang Gung University College of Medicine; Taoyuan; Taiwan
2. Department of Public Health; College of Medicine; Chang Gung University; Taoyuan; Taiwan
3. Division of Rheumatology; Department of Internal Medicine; Chang Gung Memorial Hospital at Linkou; Chang Gung University College of Medicine; Taoyuan; Taiwan