In step one of the two-step approach, each participant was screened for epilepsy and WSCH using a screening questionnaire (S1 Questionnaire). Questions related to epilepsy were based on the International League Against Epilepsy screening of epilepsy questionnaire developed by Preux et al.[31], and was previously used in three villages in the same study area [32]. Questions related to headaches were designed to capture NCC-related headaches [33].
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