Table 2

Exclusion criteria

Significant hearing or vision loss
Other neurological disorders, e.g. cerebral palsy, phenylketonuria, tuberous sclerosis, neurofibromatosis, seizure disorder
Genetic disorder
Prematurity (<32 weeks gestation)
Diagnosis of coeliac disease or other gastrointestinal disease associated with malabsorption
Previous treatment with secretin
Anaemia and plumbism (lead poisoning)