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Table 1 EMBASE search strategy

From: Risk of major bleeding during extended oral anticoagulation in patients with first unprovoked venous thromboembolism: a systematic review and meta-analysis protocol

No. Searches
1 Venous Thrombosis/
2 (ven* adj2 thrombos*).ti, ab.
3 Deep Vein Thrombosis/
4 (deep adj3 thrombos*).ti, ab.
5 Pulmonary Embolism/
6 (pulmonary adj2 embolism*).ti, ab.
7 Venous Thromboembolism/
8 (ven* adj2 thromboembolism*).ti, ab.
9 Recurrent Venous Thromboembolism/
10 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9
11 secondary prevention/
12 secondary prevention*.ti, ab.
13 (relapse adj2 prevention*).ti, ab.
14 (extended adj2 therap*).ti, ab.
15 11 or 12 or 13 or 14
16 Hemorrhage/
17 (hemorrhag* or haemorrhag*).ti, ab.
18 16 or 17
19 Anticoagulants/
20 Antithrombins/
21 (anticoagulant* or anti-coagulant* or antithrombin* or anti-thrombin*).tw.
22 (thrombin adj3 inhibit*).tw.
23 (Factor Xa adj2 (antagonist? or inhibit* or block*)).tw.
24 heparin/ or exp heparin, low-molecular-weight/
25 (heparin* or beparine or clarin or contusol or disebrin or eleparon or elheparin or elheparon or epiheparin or gag 98 or helberina or hepaflex or hepalean or heparitin* or hepcon or hepsal or inhepar or inviclot or lipo-hepin or lipohepin or liquemin or liquemine or menaven or monoparin or mucoitin or multiparin or nevparin or noparin or panheparin or panhepin or panheprin or parinix or praecivenin or pularin or thromb*or niparin or vetren or vaster).tw.
26 liquaemin.tw.
27 dalteparin*.tw.
28 fragmin*.tw.
29 enoxaparin*.tw.
30 clexane.tw.
31 lovenox.tw.
32 fraxiparin*.tw.
33 nadroparin*.tw.
34 Warfarin/
35 (warfarin or warfant or tedicumar or savaysa or endoxaban or befarin or adoisine or carfin or circuvit or coumadan or coumafene or coumaphene or dagonal or tintorane or uniwarfin or waran or warfar or warnerin or farin or jantoven or kumatox or maforan or orfarin or panwarfarin or panwarfin or prothromadin or warfil* or sofarin).tw.
36 coumadin*.tw.
37 aldocumar.tw.
38 marevan.tw.
39 (Vitamin K adj2 (antagonist? or inhibit* or block*)).tw.
40 19 or 20 or 21 or 22 or 23 or 24 or 25 or 26 or 27 or 28 or 29 or 30 or 31 or 32 or 33 or 34 or 35 or 36 or 37 or 38 or 39
41 (random$ or placebo$ or single blind$ or double blind$ or triple blind$).ti, ab.
42 RETRACTED ARTICLE/
43 or/41-42
44 (animal$ not human$).sh,hw.
45 (book or conference paper or editorial or letter or review).pt. not exp. randomized controlled trial/
46 (random sampl$ or random digit$ or random effect$ or random survey or random regression).ti, ab. not exp. randomized controlled trial/
47 43 not (44 or 45 or 46)
48 exp cohort analysis/
49 exp longitudinal study/
50 exp prospective study/
51 exp follow up/
52 cohort$.tw.
53 or/48–52
54 47 or 53
55 10 and 15 and 18 and 40 and 54
56 10 and 18 and 40 and 54