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-- Ajdacic-Gross (2010):
--- Interviews with 9814 Swiss conscripts
--- 408 stuttered during infancy
--- Risk factors for stuttering (with decreasing importance):
---- Incubator (i.e. premature birth)
---- Attention deficit hyperactivity disorder
---- Alcohol abuse of the parents
---- Anxiety disorders and obsessive-compulsive disorders in family members and relatives
---- Parent from a foreign country
-- Zhang (2012):
--- 1490 of 4234 German stutterers are bilingual; =35,2%
--- 35,4% of German children under 5 years come from immigrant families