Table 2.

Search strategy for Cochrane Central Register of Controlled Trials

ID	Search
#1	[mh “Respiratory Distress Syndrome, Adult”]
#2	[mh “Acute lung injury”]
#3	ALI:ti, ab OR ARDS:ti, ab
#4	Acute:ti, ab
#5	lung NEXT injur*:ti, ab
#6	“respiratory distress”:ti, ab
#7	“respiratory failure”:ti, ab
#8	#4 AND (#5 OR #6 OR #7)
#9	(Severe:ti, ab OR critical*:ti, ab) AND (respiratory:ti, ab OR hypox*:ti, ab)
#10	#1 OR #2 OR #3 OR #8 OR #9
#11	[mh biopsy] AND [mh lung]
#12	(cryosurger*:ti, ab OR cryobiopsy:ti, ab OR biopsy:ti, ab) AND lung:ti, ab
#13	[mh bronchoscopy]
#14	[mh “Thoracic Surgery, Video-Assisted”]
#15	#11 OR #12 OR #13 OR #14
#16	#10 AND #15
#17	[mh animals] NOT [mh human]
#18	#16 NOT #17