Effects of high altitude on respiratory rate and oxygen saturation reference values in healthy infants and children younger than 2 years in four countries: a cross-sectional study by Mary E Crocker, MD, Shakir Hossen, MBBS, Dina Goodman, MSPH, Suzanne M Simkovich, MD, Miles Kirby, PhD, Lisa M Thompson, PhD, Ghislaine Rosa, PhD, Sarada S Garg, DNB, Gurusamy Thangavel, MSc, Eric D McCollum, MD, Jennifer Peel, ProfPhD, Thomas Clasen, ProfPhD, William Checkley, MD

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