RT Journal Article SR Electronic T1 World at work: Brazilian ragpickers JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 736 OP 740 DO 10.1136/oem.2005.020164 VO 62 IS 10 A1 M C da Silva A1 A G Fassa A1 C E Siqueira A1 D Kriebel YR 2005 UL http://oem.bmj.com/content/62/10/736.abstract AB