[1] Harbin Med Univ, Sch Publ Hlth, Dept Hlth Policy & Hosp Management, Harbin 150081, Peoples R China
[2] Harbin Med Univ, Sch Humanities & Social Sci, Harbin 150081, Peoples R China
[3] Chinese Acad Social Sci, Inst Quantitat & Tech Econ, Beijing 100000, Peoples R China
[4] Harbin Med Univ, Sch Publ Hlth, Dept Social Med, Harbin 150081, Peoples R China
[5] Jiamusi Univ, Sch Publ Hlth, Jiamusi 154007, Peoples R China
[6] QiQihar Med Univ, Sch Publ Hlth, Qiqihar 161006, Peoples R China
[7] QiQihar Med Univ, Affiliated Hosp 3, Continuing Educ Sect, Qiqihar 161000, Peoples R China
[8] Heilongjiang Nursing Coll, Dept Publ & United Front Work, Harbin 150081, Peoples R China
[9] Harbin Med Univ, Affiliated Hosp 2, Dept Computed Tomog, Harbin 150081, Peoples R China