All info is taken from the following sources:

American Cancer Society,

U.S. Dept. of Labor, Occupational Safety & Health Administration,
Pass, H., Vogelzang, N., & Carbone, M. (Eds.). (2005). Malignant Mesothelioma: Advances in Pathogenesis, 

Diagnosis, and Translational Therapies. New York, NY: Springer.
Occupational Exposure to Hazardous Agents, "Asbestos,"
National Cancer Institute, "Asbestos Exposure and Cancer Risk,"