Author details
1Department of Nursing, West China Hospital, Sichuan University, Chengdu, China. 2Department of Nursing, the First Affiliated Hospital of Kunming Medical University, Kunming, China. 3Cardiology Department, the First Affiliated Hospital of Kunming Medical University, Kunming, China.
Received: 5 June 2013 Accepted: 25 February 2014 Published: 4 March 2014