4Saxena S,Carlson D,Billington R,et al.The WHO quality of life assessment instrument (WHOQOL-BREF):the importance of its items for cross cultural research [J].Qual life Res,2001,10(8):711--721.
5Buysse DJ,Reynolds CF,Monk TH,et al.The Pittsburgh sleep quality index:a new instument for psychiatric practice and research[J].Psychiatry Res,1989,28:193--213.