1. A Brief History of Postpolio Syndrome in the United States
Lauro S. Halstead, MD 
Archives of Physical Medicine and Rehabilitation 
Volume 92, Issue 8, Pages (August 2011)
DOI: /j.apmr
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1
Mean frequency distribution per year of articles published in the medical literature for 5-year intervals, 1980 to (See Appendix 1 for search strategy and selection criteria.)
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

3. Fig 2
Number of support groups and clinics at 5-year intervals, 1985 to 2010.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions