“…More than two thirds of all studies provided sufficient information on follow‐up [3, 5, 8, 14–16, 18, 19, 22, 24–26, 28, 29, 33, 34, 36–38, 40, 41, 45–47, 49–51, 53, 54, 58–62, 65, 67–71, 73–79, 83, 84, 86–89, 91, 92, 94–101, 105, 107–111, 113, 115, 116, 118, 123–131, 135, 137, 138, 141–143, 145, 146, 148, 151–158, 160–170, 172, 174, 175, 177, 179–181, 183–186, 188, 189]. Finally, adverse events (or their absence) were clearly reported in one third of all reports .…”