1999
January January; 33 (1): 1 - 606	February February; 33 (2): 607 - 765	March March; 33 (3): 767 - 919
April April; 33 (4): 921 - 1061	May May; 33 (5): 1097 - 1250	June June; 33 (6): 1323 - 1477
July July; 34 (1): 1 - 159	August August; 34 (2): 161 - 325	September September; 34 (3): 371 - 531
October October; 34 (4): 533 - 1023	November November; 34 (5): 1025 - 1174; e1 - e10	December December; 34 (6): 1177 - 1307; e11 - e21