AmitriptylineAntidepressive Agents, TricyclicPainNortriptylineMaprotilineDibenzazepinesChronic PainPain ManagementPain MeasurementMianserinAnalgesics, Non-NarcoticPain ThresholdImipraminePain, PostoperativeLow Back PainBack PainProtriptylineAntidepressive AgentsAbdominal PainClomipramineNeck PainPain, IntractableFacial PainNomifensinePelvic PainPain PerceptionNociceptive PainAnalgesicsAcute PainPain, ReferredFluoxetineHyperalgesiaAnalgesics, OpioidAnesthetics, LocalInjections, SpinalTrimipramineDesipramineShoulder Pain