Weiser, Thomas G.; Haynes, Alex B.; Molina, George; Lipsitz, Stuart R.; Esquivel, Micaela M.; Uribe-Leitz, Tarsicio; Fu, Rui; Azad, Tej et al. (2015). "Estimate of the global volume of surgery in 2012: An assessment supporting improved health outcomes". The Lancet385: S11. doi:10.1016/S0140-6736(15)60806-6. ISSN0140-6736. PMID26313057.
Weiser, Thomas G.; Haynes, Alex B.; Molina, George; Lipsitz, Stuart R.; Esquivel, Micaela M.; Uribe-Leitz, Tarsicio; Fu, Rui; Azad, Tej et al. (2015). "Estimate of the global volume of surgery in 2012: An assessment supporting improved health outcomes". The Lancet385: S11. doi:10.1016/S0140-6736(15)60806-6. ISSN0140-6736. PMID26313057.
Weiser, Thomas G.; Haynes, Alex B.; Molina, George; Lipsitz, Stuart R.; Esquivel, Micaela M.; Uribe-Leitz, Tarsicio; Fu, Rui; Azad, Tej et al. (2015). "Estimate of the global volume of surgery in 2012: An assessment supporting improved health outcomes". The Lancet385: S11. doi:10.1016/S0140-6736(15)60806-6. ISSN0140-6736. PMID26313057.