Because of this , it has complicated the exact explanation of the genetic cause of the syndrome .
The heterogeneity of the Klippel -- Feil syndrome has made it difficult to outline the diagnosis as well as the prognosis classes for this disease .
Because of this , Klippel -- Feil syndrome has complicated the exact explanation of the genetic cause of the syndrome .
The heterogeneity of the Klippel -- Feil syndrome has made it difficult to outline the diagnosis as well as the prognosis classes for this disease .