“…There were four key characteristics found among the 20 unique definitions of master protocols (Fig. 1) [[12], [13], [14], [15], [16]] [[1], [2], [3], [4], [5],8,[17], [18], [19], [20], [21], [22]]. While all sources consistently highlighted that common infrastructure is essential for master protocols, there were some variation with respect to scope, shared ethics review, and centralized data monitoring.…”