Supplementary Appendix S2.

Socio-Graphic data

Gender:
M			F
Age:
	25-30	31-40	41-50	51-59 besides
Residency (km from place of work):
	0-10km	11-30km	31-50km	besides 50km
Marital status:
unmarried/single		married	engaged	separated\divorced
Children:
yes			no
Working Class:
medical doctors, residents, biologists, sanitary assistant, auxiliary staff, administrative staff others
Years of service:
	0-5	6-10	11-20	21-34