three groups were identified , according to the number of cafe-au-lait spots on each child : ( 1 ) those with none ( 74 % ) , ( 2 ) those with fewer than 5 ( 25 % ) , and ( 3 ) those with at least 5 ( 5 children , 2 considered to be normal , and 3 siblings each presumed to have neurofibromatosis , one having died from leukaemia ) .
C0221263
cafe-au-lait spots
C0027831
neurofibromatosis