A novel variant in the COL6A1 gene causing Ullrich congenital muscular dystrophy in a consanguineous family: a case report oleh Nirmala Dushyanthi Sirisena, U. M. Jayami Eshana Samaranayake, Osorio Lopes Abath Neto, A. Reghan Foley, B. A. P. Sajeewani Pathirana, Nilaksha Neththikumara, C. Sampath Paththinige, Pyara Rathnayake, Sandra Donkervoort, Carsten G. Bönnemann, Vajira H. W. Dissanayake