“…The major reason for exclusion was study design (56%) as many studies did not include a control group or performed a baseline measurement, or references were references were opinion pieces, letters, or comments. The 30 studies finally retained include 15 European studies (Austria, Norway, Spain, UK), 10-24 7 studies from the USA, [25][26][27][28][29][30][31] 3 studies from Australasia (Australia and New-Zealand), 32-34 2 African studies (Egypt and Zambia), 35,36 and 3 Asian studies (Japan, Pakistan, India). [37][38][39] Only for Rautek and fainting, no evidence could be identified.…”