This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.

All articles published Open Access will be immediately and permanently free for everyone to read and download.  We are continuously working with our author communities to select the best choice of license options,

• Attribution 4.0 International (CC BY 4.0) 

• You are free to:

  Share — copy and redistribute the material in any medium or format
  Adapt — remix, transform, and build upon the material for any purpose, even commercially.