The majority of such cases were still socially functional in their pastoral villages .
The number of severely affected persons was always a minority , and most persons were only affected to the extent of having a goitre and some degree of reduced cognition and growth .
The majority of such cases were still socially functional in persons ' pastoral villages .
The number of severely affected persons was always a minority , and most persons were only affected to the extent of having a goitre and some degree of reduced cognition and growth .