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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/.

1991
January January; 41 (1): 1 - 168	April April; 41 (2): 197 - 330
July July; 41 (3): 343 - 426	October October; 41 (4): 463 - 594