6[2]P.Diamond,D.Lindeman and H.Young.Social Security Around the World,in Social Security:What Role for the Future? Washington D.C:National Academy of Social Insurance and Brookings Institution Press,1996.
7[3]Cathy A.Cowan,Helen C.Lazenby,Anne B.Martin,et al.National Health Expenditures,1998.Health Care.Financing Review,1999,21(2):168.
8[4]Roehl B.Medication Prescribing for Older Adults.Annals of Long-Term care,2006,14(6):33-39.
9[5]Lawrence H.Thompson.The advantages and disadvantages of different social welfare stratagies.Social Security Bulletin,1994,57(3):3-11.
10[6]Stefanacci RG Spivack BS.Clarifying Medicare PartD Enrollment Numbers.Annals of Long -Term care.2006,14(6):13-15.
