About 85-90 percent. Not yet know the cause of this disease, but it apparent 15 percent because.4. the genetic abnormalities, such as a break.Of chromosome abnormalities
Approximately 85-90 percent Do not yet know the exact cause of this disease, but 15 percent is caused by four. Genetic disorders such as division of chromosomal abnormalities.
The 85-90 still do not know the cause of this disease, but was obviously 15 caused 4. Deformation of genetics, such as the division of of chromosome abnormalities.