2020年9月2日Clinical Case ReportsHiroaki Saito, Akihiko Ozaki, Yasuhiro Mizuno, Kozo Todo Clinical Case Reports（2020/8/31） Difficulty in diagnosing mild cases of COVID‐19 without respiratory symptoms during the Novel Coronavirus Pandemic: Careful monitoring needed for patients with persistent upper gastrointestinal symptoms
Hiroaki Saito, Akihiko Ozaki, Yasuhiro Mizuno, Kozo Todo Clinical Case Reports（2020/8/31） Difficulty in diagnosing mild cases of COVID‐19 without respiratory symptoms during the Novel Coronavirus Pandemic: Careful monitoring needed for patients with persistent upper gastrointestinal symptoms
