
Keywords: CAs, catecholamines; VMA, vanillylmandelic acid; MHPG, 4-Hydroxy-3-methoxyphenylglycol; DOPAC, 3, 4-Dihydroxyphenylacetic acid; HPLC–ECD, high performance liquid chromatography coupled with electrochemical detection; GC–MS, gas chromatography-mass spectro