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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/.

1997
January January; 47 (1): 1 - 227	April April; 47 (2): 249 - 604
July July; 47 (3): 607 - 907	October October; 47 (4): 921 - 1274