Critical Care Medicine 20 (8): 441–447. (1 August 2016). doi:10.4103/0972-5229.188171. PMC 4994122. PMID 27630454. オリジナルの3 June 2018時点におけるアーカイブ。. https://web
Indian Journal of Critical Care Medicine 13 (1): 7–11. doi:10.4103/0972-5229.53108. PMC 2772257. PMID 19881172. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2772257/