Frizzled related protein deficiency impairs muscle strength, gait and calpain 3 levels. - Casas-Fraile, Leire; Cornelis, Frederique M.; Costamagna, Domiziana; Rico, Anabel; Duelen, Robin; Sampaolesi, Maurilio M.; López de Munain, Adolfo; Lories, Rik J.; Sáenz, Amets (Orphanet Journal of Rare Diseases, 2020)