Intratester and intertester reliability and criterion validity of the parallelogram and universal goniometers for active knee flexion in healthy subjects. - Brosseau,L.; Tousignant,M.; Budd,J.; Chartier,N.; Duciaume,L.; Plamondon,S.; O'Sullivan,J.P.; O’Donoghue,S.; Balmer,S. (Physiother Res Int, 1997)