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Authors to whom correspondence should be addressed; E-Mails: tingting.liu@emory.edu (T.L.); wsun3@tulane.edu (W.S.); Tel./Fax: +1-404-988-3738 (C.L.); +1-504-988-4223 (W.S.).
All authors made important contributions to the manuscript preparation in terms of experimental design, literature search, literature review, conceptual model development, and data interpretation.
Tingting Liu and Xiaoping Luo wrote the manuscript.
Wenjie Sun, Jing Yang, Changwei Li, Xiaojing Yuan, and Song Ge critically reviewed and revised the manuscript.
All authors read and approved the final version of the manuscript.
The authors would like to thank Carolyn Brown, a nursing informationist at Emory University, for her assistance in retrieving the literature.
The authors declare no conflict of interest.
© 2015 by the authors; licensee MDPI, Basel, Switzerland.