Where a seaman is eligible to receive and receives medical aid or periodical payments at the expense of his or her employer under the terms of any enactment providing for compensation to injured or sick workers, the receipt thereof—
(a) removes any right of the seaman to receive medical treatment under section 198, to the extent that he or she receives that medical aid; and
(b) removes any right of the seaman to receive maintenance under section 198, to the extent and for so long as he or she receive the periodical payments.