<unk>  is considered a rare disorder, and its prevalence is unknown. Currently, only 14 multigenerational families with affected family members have been identified throughout North America, Europe, Mexico, and Thailand.
X-linked spinal muscular atrophy type 2
Jokela type spinal muscular atrophy
Fukuyama congenital muscular dystrophy
Distal spinal muscular atrophy type 2
Ullrich congenital muscular dystrophy
Distal spinal muscular atrophy type 1
Madras motor neuron disease
Becker muscular dystrophy