Reader Comments

Post a new comment on this article

Add one more affiliation

Posted by qingguo2 on 28 Mar 2018 at 00:51 GMT

Authors would like to add one more affiliation to the second author, Dr. Tingting Fan. The new affiliation is as follows. This is in addition to the affiliation provided in the paper.

New affiliation for Dr. Tingting Fan:
University of Chinese Academy of Sciences, Beijing, People's Republic of China, 100049

No competing interests declared.