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Free air, but where?

BMJ 2013; 347 doi: https://doi.org/10.1136/bmj.f5860 (Published 08 October 2013) Cite this as: BMJ 2013;347:f5860

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 June 2025

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AbstractFullPdf
Jan 20181111
Feb 20182833
Mar 2018520
Apr 2018820
May 2018900
Jun 20181810
Jul 2018700
Aug 2018620
Sep 2018330
Oct 2018900
Nov 20182350
Dec 20182510
Jan 2019850
Feb 2019500
Mar 2019830
Apr 20192120
May 20191610
Jun 2019600
Jul 2019910
Aug 2019901
Oct 20191220
Nov 20191910
Dec 20191020
Jan 2020601
Feb 20202820
Mar 2020300
May 20202220
Jun 20201540
Jul 20205220
Aug 20201431
Sep 20203110
Oct 20203020
Nov 20202200
Dec 20201910
Jan 20211320
Feb 2021800
Mar 20211620
Apr 20211210
May 2021910
Jun 20211300
Jul 2021710
Aug 20213810
Sep 2021910
Oct 20212200
Nov 20211700
Dec 20214621
Jan 20223630
Feb 20224321
Mar 20221320
Apr 20222420
May 20222410
Jun 2022971
Jul 20222370
Aug 20222120
Sep 20222340
Oct 20222410
Nov 20221642
Dec 20223630
Jan 20231131
Feb 20231700
Mar 20233230
Apr 20233200
May 20232620
Jun 20233130
Jul 20234110
Aug 20231310
Sep 2023922
Oct 20233300
Nov 20232400
Dec 20233910
Jan 20247340
Feb 20246120
Mar 20242220
Apr 20241600
May 20243010
Jun 20242221
Jul 20242610
Aug 20241800
Sep 20242120
Oct 20243400
Nov 20241311
Dec 202433112
Jan 20255010
Feb 20252000
Mar 20252701
Apr 20255011
May 20253800
Jun 2025900
Total189014721
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