2.2. Analytical methods The methods used for collecting and assaying biological specimens from workers with and without masks were as described (Michitsji et al., 1995). Workers wore masks only during periods of high exposure to toluene.
2.2. Analytical methodsThe methods used for collecting and assayingbiological specimens from workers with and withoutmasks were as described (Michitsji et al.,1995). Workers wore masks only during periodsof high exposure to toluene.