“…The 2016 IFSO survey has “data from 58/62 (94%) IFSO societies (except Panama, Paraguay, Philippines, Serbia), and 27 out of 58 (45.8%) reported information from their own national registries while the remaining national societies provided estimated data, although they declared a completeness of data of about 80%" [ 36 ]. Similarly, the MBSAQIP captures all surgeries performed at accredited centers, but not all BS done [ 43 ]. In addition, as non-IFSO members seem not included in the IFSO survey [ 36 ], it is uncertain whether additional numbers of BS globally were not represented in the IFSO estimate.…”