Muscle transfers in children and adults improve external rotation in cases of obstetrical brachial plexus paralysis: a comparative study. - Chomiak, Jií; Dungl, Pavel; Osádal, Martin; Frydrychová, Monika; Burian, Michal; Chomiak, Jiří; Ošťádal, Martin (International Orthopaedics, 2014)