this was from the NBYTimes ;
https://www.nytimes.com/2018/02/19/sports/olympics/germany-olympics-beer.html
I don't know how to try to get it another way.
studies have suggested NAB has help benefits
for review purposes :
and
the study :
https://www.ncbi.nlm.nih.gov/pubmed/21659904
apparently its inmproved
have you tried any that are redly available in NAmerica ?
elsewhrere ?
lastly: