[{"arm_notes": "", "treatment_id": null, "treatment_name": "Test group:The subjects from the study group receive investigational medical device Hydrogen-oxygen Generator with Nebulizer (by Shanghai Asclepius Meditec Co.; Ltd.) and basic treatment that investigators will give corresponding symptomatic support therapy according to the subjects' condition;control group:the subjects from the control group receive hospital routine oxygen supply equipment; namely; wall oxygen or cylinder oxygen; and basic therapy;", "treatment_type": "TODO", "pharmacological_treatment": "TODO"}, {"arm_notes": "", "treatment_id": null, "treatment_name": "Test group:The subjects from the study group receive investigational medical device Hydrogen-oxygen Generator with Nebulizer (by Shanghai Asclepius Meditec Co.; Ltd.) and basic treatment that investigators will give corresponding symptomatic support therapy according to the subjects' condition", "treatment_type": "TODO", "pharmacological_treatment": "TODO"}, {"arm_notes": "", "treatment_id": null, "treatment_name": "control group:the subjects from the control group receive hospital routine oxygen supply equipment; namely; wall oxygen or cylinder oxygen; and basic therapy;", "treatment_type": "TODO", "pharmacological_treatment": "TODO"}]

[{"arm_notes": "", "treatment_id": 605, "treatment_name": "Hydrogen-oxygen nebulizer", "treatment_type": "Gas inhalation", "pharmacological_treatment": "Non pharmacological treatment"}, {"arm_notes": "", "treatment_id": 1235, "treatment_name": "Standard oxygen", "treatment_type": "Respiratory support", "pharmacological_treatment": "Non pharmacological treatment"}]