title: In memoriam: Francis Hewitt Sippy, 1922-2009.
mesh_terms: D004497:Education, Dental / Q000266:history*; D049673:History, 20th Century; D049674:History, 21st Century; D007484:Iowa; D011861:Radiography, Dental / Q000266:history*; D011871:Radiology / Q000266:history*