High parental occupational social contact and risk of childhood hematopoietic, brain and bone cancers. 

High parental occupational social contact and risk of childhood hematopoietic, brain and bone cancers. 
Omidakhsh, N., Hansen, J., Ritz, B., Olsen, J., & Heck, J. E. (2019). Cancer epidemiology, 62, 101575.