Table 1.
Inclusion and exclusion criteria
| Inclusion criteria | Exclusion criteria |
|---|---|
| Original studies on aspiration pneumonia | Reviews |
| Community acquired pneumonia | Case reports |
| ≥ 75 years old | Editorials |
| Acute hospital | Conference papers |
| In English, Swedish, Danish, Norwegian, German, or Japanese | Mixed populations |
| Nursing home | |
| Non-acute environment | |
| Post-operative or post-endoscopic pneumonia | |
| COVID-19 related pneumonia | |
| Hospital-acquired pneumonia | |
| Ventilator-associated pneumonia | |
| Stroke related pneumonia | |
| In languages other than listed in the inclusion criteria |