Mohammadzadeh , A., Haghighi , M., Naderi , B., Chaudhry , A., Hussain Khan , Z., Rasouli , M. R., & Saadat , S. (2011). Comparison of two different methods of fiber-optic nasal intubation: conventional method versus facilitated method (NASAL-18). Upsala Journal of Medical Sciences, 116(2), 138–141. https://doi.org/10.3109/03009734.2010.534827