COL6A1 and Duchenne muscular dystrophy: These patients showed overlapping symptoms with DMD/BMD but turned out to be principally affected by limb-girdle muscular dystrophies, as we found disease causing variants in the following genes: FKRP (4), SGCA (2), SGCG (2), SGCB (1), CAPN3 (1), FKTN (1), POMT2 (2), SYNE1 (1), COL6A1 (1), COL6A3 (1) and PHKA1 (1).