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Myotonic dystrophy type 2
- Muscular Dystrophy (National Library of Medicine)... which are present at birth or before age 2. They can be mild or severe. Facioscapulohumeral muscular dystrophy, which often starts in the teenage years. At first, it affects the muscles of the face, shoulders, and upper arms. Each of the types of MD can be different in many ways, ...