Lan, Xi
Han, Xiaoning
Li, Qian
Yang, Qing-Wu
Wang, Jian
Article History
First Online: 19 May 2017
Change Date: 1 June 2017
Change Type: Corrigendum
Change Details: In the initial version of this article, the third sentence in the section "Prostaglandin E2 receptors" included an incorrect reference citation (ref. 151 instead of ref. 150). This error has been corrected in the HTML and PDF versions of the article.
Competing interests
: The authors declare no competing financial interests.