“…The number of patients in each study ranged from 7 to 1008. Of the 48 crossover studies, 19,20,24,25,30,32,33,35,[37][38][39][42][43][44][45]47,48,51,55,56,58,[62][63][64][65][66][67][69][70][71][72][73][74]78,79,[81][82][83]85,87,89,93,96,[100][101][102]121 most lacked or did not mention a washout period. All studies were of open-label design.…”