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1991
January Jan-Feb; 11 (1): 9 - 163	March Mar-Apr; 11 (2): 195 - 339
May May-Jun; 11 (3): 365 - 518	July Jul-Aug; 11 (4): 531 - 721
September Sep-Oct; 11 (5): 727 - 934	November Nov-Dec; 11 (6): 941 - 1148