S8 File -

A. The breakup of the set of 1359 trials into those with (i) no EC, (ii) more sites than ECs, (iii) more ECs than sites, (iv) an equal number of sites and ECs. B. For two of these subsets, a listing of the details of the site name and ECs, and for one subset, statistics of sites without an EC partner. (XLSX)