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Please note that articles before April 1999 were taken from the PubMed database, which is incomplete. To determine whether the article you are searching for is included in PubMed, go to http://www.ncbi.nlm.nih.gov/PubMed/.

2001
January January; 51 (1): 1 - 261	March March; 51 (2): 263 - 727
May May; 51 (3): 731 - 1228	July July; 51 (4): 1229 - 1618
September September; 51 (5): 1619 - 1944	November November; 51 (6): 1945 - 2230