Complex Regional Pain SyndromesReflex Sympathetic DystrophyPain MeasurementForearm InjuriesPain, IntractableAdjuvants, PharmaceuticSympathetic Fibers, PostganglionicAutonomic Nerve BlockBlisterChronic PainHyperalgesiaKetaminePainAnalgesicsCold TemperatureNeuralgiaPain ThresholdNociceptorsHandSkinInflammationSensory ThresholdsInflammation MediatorsNeural PathwaysNeural ConductionWounds and InjuriesChronic Disease