Levothyroxine use and the risk of colorectal cancer: a large population-based case–control study

Josephina G. Kuiper^*, Aline C. Fenneman, Anne H. van der Spek, Elena Rampanelli, Max Nieuwdorp, Myrthe P.P. van Herk-Sukel, Valery E.P.P. Lemmens, Ernst J. Kuipers, Ron M.C. Herings, Eric Fliers