“…Of the studies included, 1 study 13 was population based, 1 study 22 was multicenter, and the remaining were single-center studies. Four studies 17,23,25,26 were from the United States, and 4 studies 13,22,24,27 were from Europe. Overall, 3 studies 13,24,26 were considered high quality, and 5 studies 17,22,23,25,27 were considered medium quality.…”