Tarigan, Y. et al. 2021. Influence factors of cholinesterase levels among farm workers in Cikaok Village, West Pakpak District, North Sumatra, Indonesia. International Journal of Allied Medical Sciences and Clinical Research. 9, 2 (Apr. 2021), 186–191. DOI:https://doi.org/10.61096/ijamscr.v9.iss2.2021.186-191.