There shall be in the Department of Health and Human Services, in addition to the Assistant Secretaries now provided for by law, three additional Assistant Secretaries of Health and Human Services, who shall be appointed by the President, by and with the advice and consent of the Senate. The provisions of section 2 of the Reorganization Plan Numbered 1 of 1953 (67 Stat. 631) shall be applicable to such additional Assistant Secretaries to the same extent as they are applicable to the Assistant Secretaries authorized by that section.