Who is disputing its copyright status? This is an image entirely created by me from information (raw data) sourced from the National Psoriasis Foundation. I see no need for it to be removed.  
I'll withdraw the nomination. The image was so professional-looking I mistakenly thought you had downloaded it from their website. I'm sorry about the misunderstanding, and nice work on the chart.   Talk  
Kudos
Having looked at your user page, I thought I'd just say a word of appreciation for the work you do in obtaining free content.  Thanks for making the effort, and congratulations on your success. Tony Sidaway 
Thanks for the kind words!   Talk