2-Hydroxy-N-ethylsuccinimide

HESI

Oxidized metabolite of N-Ethyl-pyrrolidone. Metabolised by oxidation of 5-Hydroxy-N-ethyl-2-pyrrolidone

Specimen

Students Student groups with an even number of female and male students at the age of 20 to 29.

Sampling area

Sampling sites (humans) 4 university cities as sampling areas.

Sampling period

1991 - 2014