I'm happy to see this study finally. Surprisingly when I asked my doctor here if there were any studies on it, I was shocked to hear "Oh No!" when asked why.. she responded "1. there is no $ for funding it. 2. No one cares here about the clinical health effects, we all drink it ( +/- 45 million ), it works, and the only thing people care about is how many 'palos'/sticks get into the bag".
Personally, having drank it for 16 years, I do deeply wonder about the long term effects of it on the nervous system, which I don't think the paper addresses.