Three peer reviewed articles https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4650298/ http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2012001000007 Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email Like Loading...