Li, Qing
Kartikowati, Christina W.
Horie, Shinji
Ogi, Takashi
Iwaki, Toru
Okuyama, Kikuo
Article History
Received: 28 April 2017
Accepted: 31 July 2017
First Online: 30 August 2017
Competing Interests
: The authors declare that they have no competing interests.