Submitted on: 14 March 2018.
Revised on: 25 April 2018.
Accepted on: 05 June 2018.
___________________Global Health Research and Policy
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Submitted on: 30 April 2014.
Revised on: 24 August 2014.
Accepted on: 05 October 2014.
___________________Global Health Research and Policy
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http://reply.papertrans.cn/2/109/10830/10830-15.png
http://reply.papertrans.cn/2/109/10830/10830-16.png
Submitted on: 06 July 2022.
Revised on: 30 October 2022.
Accepted on: 09 November 2022.
___________________Global Health Research and Policy
http://reply.papertrans.cn/2/109/10830/10830-18.png
http://reply.papertrans.cn/2/109/10830/10830-19.png
Submitted on: 21 February 2018.
Revised on: 28 March 2018.
Accepted on: 16 April 2018.
___________________Global Health Research and Policy