Nishiyama, Miyuki
Yan, Jim
Yotsumoto, Junko
Sawai, Hideaki
Sekizawa, Akihiko
Kamei, Yoshimasa
Sago, Haruhiko
Article History
Received: 23 October 2014
Revised: 4 December 2014
Accepted: 7 December 2014
First Online: 8 January 2015
Competing interests
: M Nishiyama is a former employee of LabCorp Japan. J Yan is a current employee of Laboratory Corporation of America Holdings. The remaining authors have no conflict of interest.