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Clinical trial registration: looking back and moving aheadLaine, C.; Horton, R.; DeAngelis, C. D.; Drazen, J. M.; Frizelle, F. A.; Godlee, F.; Haug, C.; Hebert, P. C.; Kotzin, S.; Marusic, A.; Sahni, P.; Schroeder, T. V.; Sox, H. C.; Van Der Weyden, M. B.; Verheugt, F. W.A. · Canadian Medical Association Journal · 2007