1.	exp Arteriovenous Malformations/
2.	arteriovenous malformation$.af.
3.	arteriovenous fistula$.af.
4.	avm.af.
5.	a‐v malformation$.af.
6.	1 or 2 or 3 or 4 or 5
7.	pulmonary OR cardiac OR heart.af.
8.	6 AND 7
9.	PAVM.af.
10.	8 or 9
11.	exp Embolization, Therapeutic/
12.	emboli$.af.
13.	11 or 12
14.	10 and 13
15.	randomized controlled trial.pt.
16.	controlled clinical trial.pt.
17.	randomized.ab.
18.	placebo.ab.
19.	drug therapy.fs.
20.	randomly.ab.
21.	trial.ab.
22.	groups.ab.
23.	17 or 15 or 16 or 17 or 18 or 19 or 20 or 21
24.	(animals not (humans and animals)).sh.
25.	23 not 24
26.	14 and 25