Inclusion criteria
And at least one of the following:
Rhinorrhea Sore throat Sneezing (during this illness) Cough (acute, chronic, or productive) Wheeze Fever Shortness of breath New-onset hoarse voice (during this illness) Exclusion criteria
Lack of consent Ventilatory support Terminal disease Medical contraindication to voluntary coughing:
Uncontrolled acute heart failure (chronic heart failure was not an exclusion) History of neuromuscular disease History of lobectomy/pneumonectomy Diagnosed chronic obstructive pulmonary disease or restrictive lung disease
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