“…Ten studies were from the US, [25][26][27][35][36][37][38][39]44,45 one from Canada, 46 two from Germany, 23,34 three from Poland, 24,32,41 two from Finland, 28,42 one from Spain, 29 three from South Korea, 30,31,43 one from Italy, 33 and two from China. 40,47 Four studies received funding from industry alone, 23,24,44,46 15 studies were funded by the government alone, 22,26,27,[29][30][31]33,[35][36][37][38][39][40]43,45 four studies received funding from industry and government, 25,32,34,41 and three studies did not report the source of funding. …”