Johansson, Elin
Mei, Hong
Xiu, Lijuan
Svensson, Viktoria
Xiong, Yueling
Marcus, Claude
Zhang, Jianduan
Hagströmer, Maria
Article History
Received: 4 January 2016
Accepted: 22 June 2016
First Online: 12 July 2016
Competing interests
: The authors declare no competing financial interests.