tokens: We tentatively isolate three different types of SJS type 1A , usually recognized in childhood , with moderate bone dysplasia , corresponding to the original descriptions of Schwartz , Jampel and Aberfeld ; type 1B , similar to type 1A but recognizable at birth , with more pronounced bone dysplasia resembling Kniest dysplasia ; and type 2 , manifest at birth , with increased mortality and bone dysplasia resembling Pyle disease .