1 . SOCIAL SECURITY FOR MIGRANT WORKERS - SICKNESS INSURANCE - AGGREGATION OF INSURANCE PERIODS - COMPETENT INSTITUTION - DETERMINATION - LEGISLATION APPLICABLE - LEGISLATION OF THE MEMBER STATE WHEREIN THE WORKER IS OR WAS LAST EMPLOYED ( REGULATION NO 1408/71 OF THE COUNCIL , ARTS 13 ( 2 ) ( A ) AND 18 ) 2 . SOCIAL SECURITY FOR MIGRANT WORKERS - SICKNESS INSURANCE - CALCULATION OF BENEFIT - TAKING INTO ACCOUNT OF A PERIOD OF INCAPACITY FOR WORK UNDER THE LEGISLATION OF ANOTHER MEMBER STATE - REDUCTION OF BENEFIT PURSUANT TO ARTICLE 46 ( 3 ) OF REGULATION NO 1408/71 - PERMISSIBILITY ( REGULATION NO 1408/71 OF THE COUNCIL , ARTS 40 ( 3 ) AND 46 ( 3 ))