The issue focused on how certain risks are reduced by killing certain animal species

https://www.ncbi.nlm.nih.gov/pubmed/22684842

http://www.ncbi.nlm.nih.gov/pubmed/23667088

http://www.ncbi.nlm.nih.gov/pubmed/23692665

http://www.ncbi.nlm.nih.gov/pubmed/23