Ji Sook Park, Jae Sung Ko, Jeong Kee Seo, Jin Soo Moon, Department of Pediatrics, Seoul National University College of Medicine, Seoul 110-799, South Korea
Sung Sup Park, Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul 110-799, South Korea
Ji Sook Park, Department of Pediatrics, Gyeongsang National University School of Medicine, Jinju, Gyeongnam 660-702, South Korea
Author contributions: Ko JS and Moon JS designed the study; Park SS performed the genetic analyses; Park JS and Seo JK collected and analyzed the clinical data and wrote the paper.
Institutional review board statement: This study was carried out after obtaining the clearance from the ethical board of the hospital (GNUH 2015-09-004-001).
Conflict-of-interest statement: There was no conflict of interest among the authors.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Jeong Kee Seo, MD, PhD, Department of Pediatrics, Seoul National University College of Medicine, Daehak-ro, Jongno-gu, Seoul 110-799, South Korea. firstname.lastname@example.org
Telephone: +82-2-20723778 Fax: +82-2-20723917
Received: January 19, 2016
Peer-review started: January 20, 2016
First decision: February 18, 2016
Revised: February 29, 2016
Accepted: March 14, 2016
Article in press: March 14, 2016
Published online: May 28, 2016