Wei Han, Huan-Min Wang, Oncology Department, Beijing Children’s Hospital, Capital Medical University, Beijing 100045, China
Author contributions: Han W analyzed the data and wrote the paper; Wang HM designed the research and performed the operations.
Ethics approval: The study was reviewed and approved by the Beijing Children’s Hospital Institutional Review Board.
Informed consent statement: All study participants, or their legal guardian, provided informed written consent prior to study enrollment.
Conflict-of-interest statement: All authors have no conflicts of interest to disclose.
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: Huan-Min Wang, MD, Oncology Department, Beijing Children’s Hospital, Capital Medical University, No. 56 Nan Lishi Road, Xicheng District, Beijing 100045, China. email@example.com
Telephone: +86-10-59616413 Fax: +86-10-59718700
Received: January 8, 2015
Peer-review started: January 12, 2015
First decision: March 10, 2015
Revised: April 9, 2015
Accepted: May 21, 2015
Article in press: May 21, 2015
Published online: July 7, 2015