Breast feeding and multiple sclerosis

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Abstract
Cases and controls were selected from the patients attending the neurological outpatient department of Cardarelli General Hospital, Naples, where neurologists from the Italian association for multiple sclerosis follow up about 300 patients with this disease. Cases were all the patients observed between 1 March and 31 May 1993 who had a definite diagnosis of multiple sclerosis according to the criteria of Poser et al.3 Controls were the first patients observed in the same department during the same period who matched the cases in terms of age (plus or minus five years) and sex. Patients who declined to be interviewed or could not provide reliable information about their feeding during infancy were excluded.