1. Department of Nephrology, Chang Gung Memorial Hospital, Keelung 20401, Taiwan
2. The Graduate Institute of Clinical Medical Sciences, Chang Gung University Medical College, Taoyuan 33302, Taiwan
3. Department of Medicine, Chang Gung University, Taoyuan 33302, Taiwan
4. Department of Pediatrics, Taipei Medical University Hospital, Taipei 11031, Taiwan
5. Laboratory of Epidemiology, Department of Health Care Management, Chang Gung University, Taoyuan 33302, Taiwan
6. Department of Cardiology, Chang Gung Memorial Hospital, Keelung 20401, Taiwan