Comment on the article by Felson et al.
van der Heijde
D M
DM
van Riel
P L
PL
van 't Hof
M A
MA
van de Putte
L B
LB
D001172:Arthritis, Rheumatoid; D002986:Clinical Trials as Topic / Q000639:trends*; D006801:Humans; D012107:Research Design