Text and Data Mining valid from 2018-05-03
First Online: 3 May 2018
Compliance with Ethical Standards
: No sources of funding were received for the preparation of this article.
: Hui Shao, Vivian Fonseca, Charles Stoecker, Shuqian Liu, and Lizheng Shi have no conflicts of interest directly relevant to the content of this article.
: The datasets used for this study are publicly available and can be requested through the National Heart, Lung, and Blood Institute [CitationRef removed].