Li, Xue
Song, Peige
Timofeeva, Maria
Meng, Xiangrui
Rudan, Igor
Little, Julian
Satsangi, Jack
Campbell, Harry
Theodoratou, Evropi
Article History
Received: 3 May 2016
Accepted: 1 September 2016
First Online: 27 September 2016
Competing interests
: The authors declare no competing financial interests.