[1] Chongqing Med Univ, Nursing Coll, Chongqing, Peoples R China
[2] Chengdu Second Peoples Hosp, Dept Gynecol, Chengdu, Peoples R China
[3] Third Mil Med Univ, Daping Hosp, Dept Cardiol, Chongqing, Peoples R China
[4] Chongqing Med Univ, Nursing Coll, Yuzhong Med Coll Rd, Chongqing 400042, Peoples R China
[5] Third Mil Med Univ, Daping Hosp, Dept Cardiol, 10 Changjiang Branch Rd, Chongqing 400042, Peoples R China