title: Reply.
authors.affiliation: Department of Pediatrics, Keelung Hospital, Ministry of Health and Welfare, Keelung, Taiwan, ROC.
authors.forename: Hui-Lan
authors.initials: HL
authors.lastname: Chen
authors.affiliation: Division of Pediatrics, Cheng Hsin General Hospital, Taipei, Taiwan, ROC. Electronic address: ch9406@chgh.org.com.tw.
authors.forename: Ren-Bin
authors.initials: RB
authors.lastname: Tang