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Method of data collection and type of bias

A case-control study was performed to determine  whether head injury was associated with an increased risk of brain tumors in children 200cases from State cancer registry and 200controls recruited from the same neighborhood where cases lived.a described questionnaire completed by mothers on child's past history of head injury ,investigators found 70 cases reported a past head injury and 30controls with a past head injury of the children with brain tumors .what type of bias is likely to have influenced the findings of this study ,and why?what can be done to minimize the type of bias?

Statististical-Problems-In-Epidermiology   
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