title: Defining Chronic Pain.
authors.affiliation: Adjunct Clinical Associate Professor of Anesthesia, Department of Anesthesiology, Louisiana State University Health Science Center; drxruan88@gmail.com.
authors.forename: Xiulu
authors.initials: X
authors.lastname: Ruan
authors.affiliation: Professor and Chairman of Anesthesia, Department of Anesthesiology, Louisiana State University Health Science Center, New Orleans, Louisiana, USA.
authors.forename: Alan David
authors.initials: AD
authors.lastname: Kaye
mesh_terms: D059350:Chronic Pain / Q000145:classification* / Q000175:diagnosis; D006801:Humans