Funding for this research was provided by:
Korea University Grant
the Basic Science Research Program through the National Research Foundation funded by the Ministry of Education
the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education
Received: 4 February 2018
Accepted: 13 March 2018
First Online: 25 April 2018
Ethics approval and consent to participate
: The study received approval from the ethics committee of the Korea University Anam Hospital, Seoul, South Korea (AN13025-002). Trial registration: AN13025-002. Registered on February 28, 2013. The first participant enrolled on May 1, 2013.
: The consent for publication was obtained from all the participants to report their individual data.
: The authors declare that they have no competing interests.
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