Letter to the EditorFunctional decline at 1 year in hospitalized elderly pneumonia with SARS-CoV-2 Omicron variant:Comparison with the ancestral strain and Alpha variantNaoyuki Miyashita1, Yasushi Nakamori2, Makoto Ogata1, Naoki Fukuda1, and Akihisa Yamura11First Department of Internal Medicine, Division of Respiratory Medicine, Infectious Disease and Allergology, Kansai Medical University, Japan2Department of Emergency Medicine, Kansai Medical University Medical Center, Japan