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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/.

1994
January January; 44 (1): 24 - 176	April April; 44 (2): 187 - 375
July July; 44 (3): 379 - 593	October October; 44 (4): 827 - 849