Apixaban for the prevention of venous thromboembolism in people ...

28 Random allocation/ (72797)
29 Double blind method/ (112708)
30 Single blind method/ (15498)
31 Clinical trial/ (467920)
32 exp Clinical Trials as Topic/ (248910)
33 or/26-32 (796979)
34 (clinic$ adj trial$1).tw. (160987)
35 ((singl$ or doubl$ or treb$ or tripl$) adj (blind$3 or mask$3)).tw. (110101)
36 Placebos/ (30156)
37 Placebo$.tw. (132592)
38 Randomly allocated.tw. (12904)
39 (allocated adj2 random).tw. (670)
40 or/34-39 (334839)
41 33 or 40 (898482)
42 Case report.tw. (163123)
43 Letter/ (725669)
44 Historical article/ (279830)
45 Review of reported cases.pt. (0)
46 Review, multicase.pt. (0)
47 or/42-46 (1158609)
48 41 not 47 (872894)
49 Meta-Analysis as Topic/ (11769)
50 meta analy$.tw. (35509)
51 metaanaly$.tw. (1039)
52 Meta-Analysis/ (30619)
53 (systematic adj (review$1 or overview$1)).tw. (27764)
54 exp Review Literature as Topic/ (5843)
55 or/49-54 (74197)
56 cochrane.ab. (17451)
57 embase.ab. (14834)
58 (psychlit or psyclit).ab. (830)
59 (psychinfo or psycinfo).ab. (5105)
60 (cinahl or cinhal).ab. (5779)
61 science citation index.ab. (1356)
62 bids.ab. (292)
63 cancerlit.ab. (503)
64 or/56-63 (27532)
65 reference list$.ab. (6383)
66 bibliograph$.ab. (9092)
67 hand-search$.ab. (2741)
68 relevant journals.ab. (470)
69 manual search$.ab. (1526)
70 or/65-69 (18122)
71 selection criteria.ab. (14712)
72 data extraction.ab. (6682)
73 71 or 72 (20232)
74 Review/ (1676497)
75 73 and 74 (14054)
80
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