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What are the four phases of clinical research trials?

BMJ 2014; 348 doi: https://doi.org/10.1136/bmj.g3727 (Published 06 June 2014) Cite this as: BMJ 2014;348:g3727

Article usage

Article metrics provide readers and authors with an indication of how often a specific article has been accessed month by month. It counts three formats - abstract/extract, full text and pdf. The page is updated each day.

Usage statistics: January 2018 to May 2025

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AbstractFullPdf
Jan 201871135
Feb 20184498
Mar 201850235
Apr 2018693311
May 201886307
Jun 20184880
Jul 2018962513
Aug 20182055514
Sep 201825611022
Oct 2018201409
Nov 20182365010
Dec 2018108249
Jan 20192103416
Feb 2019137256
Mar 2019203326
Apr 20192654715
May 2019218529
Jun 2019234289
Jul 2019156223
Aug 2019101204
Oct 201941185
Nov 201928217
Dec 201939121
Jan 202075183
Feb 202055265
Mar 20205475
May 20209578
Jun 20205355
Jul 20209294
Aug 20207081
Sep 2020148129
Oct 20201771611
Nov 2020156155
Dec 2020142265
Jan 2021327269
Feb 2021211163
Mar 20212532710
Apr 2021260183
May 2021200188
Jun 2021217187
Jul 2021149194
Aug 2021215153
Sep 2021262257
Oct 2021285276
Nov 2021256246
Dec 2021150167
Jan 2022227327
Feb 2022252228
Mar 2022128178
Apr 20222574110
May 2022222228
Jun 20221922913
Jul 20222894718
Aug 2022182201
Sep 2022163277
Oct 2022134368
Nov 2022192287
Dec 20227085
Jan 20236552
Feb 2023163169
Mar 2023125125
Apr 2023119187
May 20231751415
Jun 202365134
Jul 2023119154
Aug 2023139113
Sep 2023107104
Oct 202313662
Nov 2023154247
Dec 2023165142
Jan 2024135202
Feb 2024257316
Mar 2024259285
Apr 2024241185
May 2024181113
Jun 20242312210
Jul 20249721
Aug 202411283
Sep 2024197145
Oct 2024134255
Nov 2024157255
Dec 20241423111
Jan 2025186119
Feb 202512388
Mar 202595178
Apr 202575145
May 2025841613
Total135501917596
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