RT Journal Article SR Electronic T1 Challenges of pesticide exposure assessment in occupational studies of chronic diseases JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 355 OP 356 DO 10.1136/oemed-2019-106348 VO 77 IS 6 A1 Laura E Beane Freeman YR 2020 UL http://oem.bmj.com/content/77/6/355.abstract AB