Merosin-deficient congenital muscular dystrophy with severe mental retardation and normal cranial MRI: a report of two siblings. - Topaloglu,H.; Talim,B.; Vignier,N.; Helbling-Leclerc,A.H.; Yetuk,M.; Afsin,I.E.; Caglar,M.; Kale,G.; Guicheney,P. (Neuromusc Disord, 1998)