[ohtwenty]

This got me curious, so I looked a few things up on pubmed. Here's some articles that piqued my interest:

https://www.ncbi.nlm.nih.gov/pubmed/24086443 https://www.ncbi.nlm.nih.gov/pubmed/24163237 https://www.ncbi.nlm.nih.gov/pubmed/22320194