Yang, C. H.
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          Lee, Y. T., Tsai, C. F., Ouyang, W. C., Yang, A. C., Yang, C. H., Hwang, J. P.    
          (2013)    
          Daytime sleepiness: A risk factor for poor social engagement among the elderly    
          Psychogeriatrics    
          13    
          4    
          213-220