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Value of a rigid collar: in need of more research and better devices

 

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Jun 2012158610
Jul 20123102640
Aug 20121132511
Sep 20126652
Oct 20123822
Nov 2012076
Dec 2012011
Jan 2013031
Feb 2013034
Mar 2013012
Apr 2013027
May 201303635
Jun 2013671317
Jul 20132056
Aug 201324514
Sep 20131554
Oct 20131567
Nov 2013737
Dec 20136104
Jan 2014656
Feb 20141277
Mar 2014933
Apr 20141384
May 201414138
Jun 2014764
Jul 20141588
Aug 201410710
Sep 20142050
Oct 20144668
Nov 2014747
Dec 2014521
Jan 20151367
Feb 20151864
Mar 20153354
Apr 201550710
May 20153614
Jun 20151907
Jul 20153524
Aug 20152855
Sep 20153294
Oct 201519121
Nov 20154075
Dec 20155431
Jan 20164013
Feb 20161900
Mar 201623158
Apr 201638713
May 20161926
Jun 20161627
Jul 20161714
Aug 20162110
Sep 20164046
Oct 20166811
Nov 20167762
Dec 20162021
Jan 20172141
Feb 20173734
Mar 2017252710
Apr 201732115
May 20173052
Jun 20172100
Jul 20175550
Aug 20174065
Sep 20174921
Oct 20176241
Nov 20175832
Dec 20175680
Jan 201864103
Feb 201876103
Mar 20187572
Apr 20189950
May 20183130
Jun 20183111
Jul 20185550
Aug 20184253
Sep 20182200
Oct 20183231
Nov 20185520
Dec 20182830
Jan 20193052
Feb 20192442
Mar 20192510
Apr 20191402
May 20194631
Jun 2019913
Jul 20191420
Aug 20191904
Sep 20191610
Oct 20192720
Nov 2019810
Dec 2019822
Jan 20204430
Feb 20202773
Mar 20203741
Apr 20202120
May 20204182
Jun 202031101
Jul 202038105
Aug 20202600
Sep 20203040
Oct 20201211
Nov 20201822
Dec 20202200
Jan 20213043
Feb 20213940
Mar 20214251
Apr 20213412
May 20212200
Jul 2021620
Aug 2021430
Sep 2021220
Oct 20211300
Nov 20213410
Dec 20211300
Jan 20225902
Feb 20222221
Mar 20222711
Apr 20226933
May 20224035
Jun 20222501
Jul 20222621
Aug 20223222
Sep 20221912
Oct 20221551
Nov 20222930
Dec 20222442
Jan 20231400
Feb 20235730
Mar 202365125
Apr 20236361
May 20231800
Jun 20232540
Jul 20231200
Aug 20232100
Sep 20234371
Oct 20232210
Nov 20236912
Dec 20235060
Jan 20241800
Feb 20243791
Mar 20245830
Total4659648465