Ma, Seung-Hyun
Jung, Woohyun
Weiderpass, Elisabete
Jang, Jieun
Hwang, Yunji
Ahn, Chunghyun
Ko, Kwang-Pil
Chang, Soung-Hoon
Shin, Hai-Rim
Yoo, Keun-Young
Park, Sue K
Article History
Received: 6 May 2015
Revised: 5 August 2015
Accepted: 12 August 2015
First Online: 17 September 2015
Competing interests
: The authors declare no conflict of interest.