Active monitoring versus an abduction device for treatment of infants with centered dysplastic hips: study protocol for a randomized controlled trial (TReatment with Active Monitor... oleh Frederike E. C. M. Mulder, M. Adhiambo Witlox, Carmen D. Dirksen, Pieter Bas de Witte, Suzanne de Vos-Jakobs, Arno M. ten Ham, Melinda M. E. H. Witbreuk, Ralph Sakkers, Magritha (Margret) M. H. P. Foreman-van Drongelen, Simon G. F. Robben, TRAM-Trial Consortium, Nina M. C. Mathijssen