“…Sources have included measurements from regulatory health and safety inspections [3, 4•,5–7], industrial hygienic surveys undertaken by research, university, medical, and government groups [8–12, 13••,14–16], industry databases and reports [10, 11, 14, 17•], published literature [10, 12, 13••, 18, 19], and unpublished technical reports [12, 13••]. Many of these sources have been compiled into large national and international exposure databases [8, 11, 12, 14, 20, 21].…”