title: In Memoriam--Robert E. Ryan, Sr., MD.
authors.affiliation: Medical Director, Ryan Headache Center, Vice President-Research, Mercy Clinic, St. Louis, MO, USA.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Smith
mesh_terms: D006261:Headache / Q000266:history*; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D018156:Journalism, Medical / Q000266:history*; D009462:Neurology / Q000266:history*