Zhao, Zhihui
Li, Yi
Ullah, Kifayat
Sapkota, Basanta
Bi, Hongbin
Wang, Yongqing
Article History
Received: 3 October 2017
Accepted: 19 December 2017
First Online: 3 February 2018
Compliance with ethical standards
:
: Yongqing Wang decided not to be the first author any more on his own will but continued to be the corresponding author. Zhihui Zhao and Yi Li’s contributions are equal to this study. All the authors have agreed that they can be the first author at the same time. On behalf of all the authors, we disclose any financial and personal relationships with other people, or organizations, that could inappropriately influence our work. There are no conflicts of interest among all the authors.