Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, Kaohsiung 833, Taiwan. Liver Transplantation Center, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan. Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan. Faculty of Nursing, Josai International University, Togane 283-8555, Japan. Kazusa Institute for Drug Discovery, Josai International University, Togane 283-8555, Japan. Nobeoka Medical Check Center, Fukuoka Institution of Occupational Health, Nobeoka 882-0872, Japan.