title: Ultraclean hospital facilities: Five years of experience.
mesh_terms: D000397:Air Pollution / Q000032:analysis / Q000517:prevention & control; D001431:Bacteriological Techniques; D005374:Filtration; D006761:Hospitals / Q000592:standards*; D009873:Operating Rooms / Q000592:standards; D010347:Patient Care Planning; D012499:Sanitation