Author names, affiliations:
Xiangmao Bu, Peng Sun, Yanzhen Wan #
Clinical laboratory, Qingdao Women and Children’s Hospital, Qingdao Women and Children’s Hospital Affiliated to Qingdao University, Qingdao 266034, China
# Correspondence to: Yanzhen Wan, Clinical laboratory, Qingdao Women and Children’s Hospital, Qingdao Women and Children’s Hospital Affiliated to Qingdao University, Qingdao 266034, China. E-mail:wanyanzhen1979@163.com
Funding sources: This work was supported by a grant from the Municipal Key Clinical Specialty Programs fo Qingdao.
Conflict of interests: We declare no competing interests.
Informed consent: Written consent for publication was obtained from the patient’s parents.