Free License permits: Sharing, copying and redistributing in any medium or format including adapting, remixing, transforming, and building upon the material for any purpose, even commercially. Attribution required.
License: Creative Commons 3 – CC BY-SA 3.0
Required attribution: Alpha Stock Images – link to – http://alphastockimages.com/
Original Author: Nick Youngson – link to – http://nyphotographic.com/
Date first licensed: December 2015
Original Image: http://www.thebluediamondgallery.com/highlighted/a/asthma.html