Immunological and Preventive Effects of Hochuekkito and Kakkonto Against Coronavirus Disease in Healthcare Workers: A Retrospective Observational Study by Keiko Ogawa-Ochiai, Hideki Ishikawa, Hongyang Li, Lam Vu Quang, Izumi Kimoto, Mitsuyuki Takamura, Tetsuya Hongawa, Yasuyuki Hane, Susumu Suzuki, Susumu Suzuki, Masaki Okajima, Keita Mori, Masanori Ito, Akiyoshi Takami

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