| # | Searches | Results |
|---|---|---|
| 1 | endotracheal intubation.mp. or exp Intubation, Intratracheal/ | 84661 |
| 2 | Intubation, Intratracheal/or tracheal intubation.mp. or Airway Management/ | 91542 |
| 3 | airway protection.mp. | 1863 |
| 4 | exp Gastrointestinal Hemorrhage/or exp "Esophageal and Gastric Varices"/or upper gastrointestinal bleed$.mp. | 159044 |
| 5 | gastrointestinal bleeding.mp. | 39897 |
| 6 | exp Hematemesis/ | 10361 |
| 7 | gastrointestinal bleeding.mp. | 39897 |
| 8 | 1 or 2 or 3 | 101741 |
| 9 | 4 or 5 or 6 or 7 | 170084 |
| 10 | 8 and 9 | 499 |
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