Submitted on: 13 December 2015.
Revised on: 14 January 2016.
Accepted on: 28 January 2016.
Open Access Journal of Clinical Trials
http://reply.papertrans.cn/3/237/23625/23625-32.png
http://reply.papertrans.cn/3/237/23625/23625-33.png
http://reply.papertrans.cn/3/237/23625/23625-34.png
http://reply.papertrans.cn/3/237/23625/23625-35.png
http://reply.papertrans.cn/3/237/23625/23625-36.png