Associations between abnormal ultrasound color Doppler measures and tendon pain symptoms in badminton players during a season: a prospective cohort study - Boesen, A P; Boesen, M I; Torp-Pedersen, S; Christensen, R; Boesen, L; Hölmich, P; Nielsen, M B; Koenig, M J; Hartkopp, A; Ellegaard, K; Bliddal, H; Langberg, H (Am J Sports Med, 2012)