9Mazza M,Della Marca G,De Risio S,et al.Sleep disorders in the elderly.Clin Ter 2004;155(9):391-4.
10Tanaka H,Shirakawa S.Sleep health,lifestyle and mental health in the Japanese elderly:ensuring sleep to promote a healthy brain and mind.J-Psychosom-Res 2004;56(5):465-77.