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Regression of CENTRIFUGE HORIBA (centrifuge sweat extraction, compact Horiba B‐731 analysis), SYRINGE HPLC (syringe sweat extraction, HPLC analysis), and SYRINGE HORIBA (combined field technique using syringe sweat extraction and compact Horiba B‐731 analysis) on CENTRIFUGE HPLC (reference laboratory technique using centrifuge sweat extraction and ion chromatography analysis) for sweat [K+]. n = 116. Dashed line is the line of identity.
