title: The pain visual analog scale: linear or nonlinear?
authors.forename: Paul S
authors.initials: PS
authors.lastname: Myles
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage / Q000627:therapeutic use; D006801:Humans; D016014:Linear Models; D009020:Morphine / Q000008:administration & dosage / Q000627:therapeutic use; D017711:Nonlinear Dynamics; D010146:Pain / Q000188:drug therapy / Q000523:psychology; D010147:Pain Measurement / Q000706:statistics & numerical data*
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine