PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) was my first link, and I sincerely hope you take advantage of it. All the publications whose contents are listed there are from peer-reviewed journals, which means not just industry and govermnent people look at the study to see that it's scientifically valid. Even if you can't view the full content outside a library, you can read the abstracts.

And discounting the information on a nonprofit website based on who advertizes there is just plain silly. My nonprofit chorus, San Diego Master Chorale (http://www.sdmasterchorale.org/), helped sponsor our season. That doesn't mean we sing songs about gambling or that money you give to us will go to support gamblers.