Kim, Su Yeong
Hou, Yang
Funding for this research was provided by:
National Institute of Child Health and Human Development (NICHD 5R03HD051629-02)
National Institute of Child Health and Human Development (NICHD 5R24HD042849-14)
Article History
Received: 2 October 2015
Accepted: 11 January 2016
First Online: 18 January 2016
Conflict of interest
: The authors declare that they have no conflict of interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.