Insecticide Residues on Hands: Assessment and Modeling with Video Observations of Determinants of Exposure-A Study Among Subsistence Farmers in Nicaragua. Lylliam Lpez,   Luis Blanco, Aurora Aragn and Timo Partanen.Journal of Occupational and Environmental Hygiene, Volume 6, Issue 3 March 2009 , pages 157 – 164. See abstract.