External validation of the HACOR score and ROX index for predicting treatment failure in patients with coronavirus disease 2019 pneumonia managed on high-flow nasal cannula therapy... by Hiromu Okano, Ryohei Yamamoto, Yudai Iwasaki, Daisuke Irimada, Daisuke Konno, Taku Tanaka, Takatoshi Oishi, Hiroki Nawa, Akihiko Yano, Hiroaki Taniguchi, Masayuki Otawara, Ayaka Matsuoka, Masanori Yamauchi

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