#	Searches
1	(pneumothora* or “pneumo thora*”).tw,kw.
2	PTX.tw,kw.
3	1 or 2
4	radiograph*.tw,kw.
5	roentgen*.tw,kw.
6	radiogram*.tw,kw.
7	radiology.tw,kw.
8	chest film*.tw,kw.
9	CXR.tw,kw.
10	x‐ray*.tw,kw.
11	x ray*.tw,kw.
12	xray*.tw,kw.
13	4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12
14	(Ultrasound* or "ultra sound*").tw,kw.
15	sonogra*.tw,kw.
16	(ultrasonogra* or "ultra sonogra*”).tw,kw.
17	CUS.tw,kw.
18	ultrasonic.tw,kw.
19	echotomograph*.tw,kw.
20	echograph*.tw,kw.
21	14 or 15 or 16 or 17 or 18 or 19 or 20
22	3 and 13 and 21