Exercise-induced rib stress fractures: potential risk factors related to thoracic muscle co-contraction and movement pattern - Vinther, A.; Kanstrup, I.-L.; Christiansen, E.; Alkjær, T.; Larsson, B.; Magnusson, S. P.; Ekdahl, C.; Aagaard, P. (Scandinavian Journal of Medicine & Science in Sports, 2006)