AAPM medical physics practice guideline 3.b.: Levels of supervision for medical physicists in clinical training. - Pfeiffer, Douglas; Al‐Hallaq, Hania; Halvorsen, Per; Hendrickson, Kristi; Lu, Zheng Feng; Martin, Melissa Carol; Schueler, Beth; Shuman, Jillian; E. Zoberi, Jacqueline (Journal of Applied Clinical Medical Physics, 2021)