Department of Internal Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan. Division of Allergy, Immunology, and Rheumatology, Department of Internal Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan. Division of Allergy, Asthma, and Rheumatology, Department of Pediatrics, Chang Gung Memorial Hospital, Taoyuan, Taiwan. College of Medicine, Chang Gung University, Taoyuan, Taiwan. Graduate Institute of Medical Science, National Defense Medical Center, Taipei, Taiwan.