title: What does HPD really mean?
authors.forename: J D
authors.initials: JD
authors.lastname: Spikes
mesh_terms: D017324:Hematoporphyrin Derivative; D006415:Hematoporphyrins; D016239:MEDLINE; D011838:Radiation-Sensitizing Agents; D009626:Terminology as Topic; D014481:United States; D014925:Wit and Humor as Topic
chemical_list: D006415:Hematoporphyrins; D011838:Radiation-Sensitizing Agents; D017324:Hematoporphyrin Derivative