methodology
        Volrathongchai, K., Brennan, P. F., Ferris, M. C. 2005. Predicting the likelihood of falls among the elderly using likelihood basis pursuit technique. AMIA ... Annual Symposium proceedings / AMIA Symposium. AMIA Symposium.   () 764-768.  
          Wu, N., Miller, S. C., Lapane, K., Roy, J., Mor, V. 2005. Impact of cognitive function on assessments of nursing home residents' pain. Medical Care.  43 (9) 934-939.