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  • This analysis followed a case crossover procedure where each subject with event contributes information as a case and as matched control during nonevents times. [18] We used two different methods of case definitions (exposure period); (1) case period was defined as the hospitalization day, while for the control period we used every third day either before or after the hospitalization day within the same calendar month [19] (2) case and control period defined as fix periods of 8 weeks strata (a month from a hospitalization day, bidirectional).
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