Nociceptive PainVisceral PainVisceral AfferentsPainAbdominal PainPain ThresholdChronic PainPain ManagementPain, PostoperativeLow Back PainBack PainPain MeasurementNeck PainPain, IntractablePelvic PainPain PerceptionFacial PainAcute PainPain, ReferredShoulder PainMusculoskeletal PainAnalgesicsNeuralgiaAnalgesics, OpioidMyofascial Pain SyndromesHyperalgesiaComplex Regional Pain SyndromesChronic DiseaseArthralgiaAnalgesiaLabor PainTreatment OutcomeNociceptorsFibromyalgiaQuestionnairesAnesthetics, LocalDisability EvaluationCatastrophizationFlank PainEye PainProspective Studies