Department of Internal Medicine, Lee's Endocrinology Clinic, Pingtung City 900, Taiwan. Department of Internal Medicine, Kaohsiung Municipal Siaogang Hospital, Kaohsiung Medical University, Kaohsiung 812, Taiwan. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan. Department of Electronics Engineering, Institute of Electronics, National Chiao Tung University, Hsinchu 300, Taiwan. Hengchun Navaids Site, Kaohsiung Aviation Facilities Sector, Air Navigation and Weather Services, Ministry of Transportation and Communications, Hengchun 946, Taiwan. Certified Diabetic Educator of Endocrinology & Metabolism Ward, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan. Department of Nursing, Kaohsiung Municipal Siaogang Hospital, Kaohsiung 812, Taiwan. Division of Nephrology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan. Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan. Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.