MDRS1: Muscular Dystrophy, Congenital, Merosin-Positive, with Early Spine Rigidity

What does MDRS1 mean? The above is one of MDRS1 meanings. It may have other definitions. Please refer to the end of this passage.

Definition in English: Muscular Dystrophy, Congenital, Merosin-Positive, with Early Spine Rigidity