Funding for this research was provided by:
Manned Spaceflight Program of China (2014SY54A0001)
Text and Data Mining valid from 2018-05-30
Received: 17 December 2017
Accepted: 10 May 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: Not applicable.
: Written informed consent was obtained from the person for publication of this review and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
: The authors declare that they have no competing interests.