worker human 14 article 12 controlled study 8 male 8 female 7 adult 5 major clinical study 4 human experiment 3 risk factor 3 Article 2 Physical activity 2 child 2 clinical article 2 clinical assessment 2 demography 2 employee 2 job stress 2 quantitative analysis 2 workplace 2 1,3 butadiene 1 1,3-butadiene 1 5 methyltetrahydrofolic acid 1 5,10 methylenetetrahydrofolate reductase (FADH2) 1 Accountability 1 Actigraphy 1 Biological health 1 Child 1 Child Care 1 Child care 1