title: EMS development in Pennsylvania: an overview.
authors.forename: J
authors.initials: J
authors.lastname: Grottenthaler
authors.forename: R S
authors.initials: RS
authors.lastname: Evans
authors.forename: W C
authors.initials: WC
authors.lastname: Dethlefs
authors.forename: H A
authors.initials: HA
authors.lastname: Muller
mesh_terms: D004632:Emergency Medical Services / Q000458:organization & administration*; D010414:Pennsylvania; D012040:Regional Health Planning; D012041:Regional Medical Programs / Q000458:organization & administration*