| 1. | operating room/ |
| 2. | *microclimate/ |
| 3. | *air conditioning/ |
| 4. | *air filter/ |
| 5. | ((operat* or surger* or surgical or theat* or room*) adj5 (ventilat* or air* or environment* or climate*)).ti,ab. |
| 6. | ((air* or technolo*) adj3 (filter* or filtration or purifi* or purify* or condition* or quality)).ti,ab. |
| 7. | (high efficiency particulate or HEPA).ti,ab. |
| 8. | ((exponential or vertical or horizontal or laminar or plenum or “ceiling to floor” or “wall mounted”) adj3 air*).ti,ab. |
| 9. | (LAF or Exflow).ti,ab. |
| 10. | ((ultra clean or ultraclean or clean* or Charnley or Howorth) adj3 (air* or ventilat* or enclosure* or technolo*)).ti,ab. |
| 11. | (UCA or UCV).ti,ab. |
| 12. | or/1–11 |
| 13. | letter.pt. or letter/ |
| 14. | note.pt. |
| 15. | editorial.pt. |
| 16. | case report/ or case study/ |
| 17. | (letter or comment*).ti. |
| 18. | or/13–17 |
| 19. | randomized controlled trial/ or random*.ti,ab. |
| 20. | 18 not 19 |
| 21. | animal/ not human/ |
| 22. | nonhuman/ |
| 23. | exp Animal Experiment/ |
| 24. | exp Experimental Animal/ |
| 25. | animal model/ |
| 26. | exp Rodent/ |
| 27. | (rat or rats or mouse or mice).ti. |
| 28. | or/20–27 |
| 29. | 12 not 28 |
| 30. | limit 29 to English language |
| 31. | health economics/ |
| 32. | exp economic evaluation/ |
| 33. | exp health care cost/ |
| 34. | exp fee/ |
| 35. | budget/ |
| 36. | funding/ |
| 37. | budget*.ti,ab. |
| 38. | cost*.ti. |
| 39. | (economic* or pharmaco?economic*).ti. |
| 40. | (price* or pricing*).ti,ab. |
| 41. | (cost* adj2 (effective* or utilit* or benefit* or minimi* or unit* or estimat* or variable*)).ab. |
| 42. | (financ* or fee or fees).ti,ab. |
| 43. | (value adj2 (money or monetary)).ti,ab. |
| 44. | or/31–43 |
| 45. | 30 and 44 |
From: Evidence review for ultra-clean air
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.