Section 1. Any provision of law to the contrary notwithstanding, any physician serving in any hospital under the jurisdiction of the Philippine Health Service, excepting interns, who by virtue of Act Numbered Twenty-nine hundred and thirty-five is entitled to practice privately, may receive a share of his receipts for professional services rendered to private or pay patients in or outside the hospital, during or outside of office hours, on recommendation of the
Director of Health and with the approval of the Department Secretary: Provided, That not less than twenty-five per centum of such receipts shall go to the hospital.