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1990
January January; 18 (1): - 1 - 113	March March; 18 (2): - 119 - 220	June June; 18 (3): - 225 - 330
July July; 18 (4): - 335 - 442	September September; 18 (5): - 449 - 561	December December; 18 (6): - 567 - 657