Notwithstanding s. 448.05 (2), a person who, on April 1, 2015, possessed a valid license to practice medicine and surgery under s. 448.05 (2) or 448.065, 2011 stats., may retain, practice under, and continue to renew that license, subject to any other provisions in this subchapter or any rules promulgated by the board governing a license to practice medicine and surgery.