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1990
January January; 18 (1): 1 - 112	March March; 18 (2): 119 - 220	May May; 18 (3): 225 - 325
July July; 18 (4): 335 - 441	September September; 18 (5): 449 - 561	November November; 18 (6): 568 - 656