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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/.

1993
January January; 43 (1): 1 - 182	April April; 43 (2): 196 - 387
July July; 43 (3): 425 - 629	October October; 43 (4): 735 - 753