e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
Simultaneous micro-determination of serotonin and 5-hydroxyindole-3-acetic acid with 5-hydroxy-N omega-methyltryptamine, as an internal standard, in biological materials by high-performance liquid chromatography with electrochemical detection.