“…Most of the studies were conducted in Germany. [25][26][27][28]32,36,[46][47][48] The other studies were conducted in the USA, 17,20 France, 18,22,49 Italy, 21,43,45,51 Spain, 23,30 Brazil, 24 Belgium, 29,35 Egypt, 31,33 Canada, 34 Bulgaria, 37 China, 39,41 Sweden, 40 Japan, 19,42 India, 44 and Poland. 50 One study was multinational and was conducted at 17 international institutions in Canada, Italy, the USA, and the UK.…”