2001
January January; 20 (1): 1 - 59	February February; 20 (2): 61 - 119	March March; 20 (3): 121 - 168
April April; 20 (4): 169 - 219	May May; 20 (5): 221 - 278	June June; 20 (6): 279 - 320
July July; 20 (7): 321 - 380	August August; 20 (8): 381 - 438	September September; 20 (9): 439 - 495
October October; 20 (10): 497 - 550	November November; 20 (11): 551 - 599	December December; 20 (12): 601 - 660