“…No randomized controlled studies were identified. The studies originated from Spain, 32 Germany, 20,24,27,33 USA, 22,28,29,34–36 China, 37,38 Italy, 21 Sweden, 23,39 the United Kingdom, 25,26,40 the Netherlands, 31,41,42 New Zealand, 30 Denmark, 43 and Canada 44 . In total 6972 participants were included.…”