2-Hydroxy-N-ethylsuccinimide
HESI
Oxidized metabolite of N-Ethyl-pyrrolidone. Metabolised by oxidation of 5-Hydroxy-N-ethyl-2-pyrrolidone
Specimen
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Student groups with an even number of female and male students at the age of 20 to 29.
Sampling area
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4 university cities as sampling areas.
Sampling period
1991 - 2014