Abstract

• No more than approx. 500 words (or 3,000 characters).
  
• Headings in structured abstracts should be bold and followed by a period. Each heading should begin a new paragraph. For example:
  

  Background. The background section text goes here. Next line for new section.
  

  Methods. The methods section text goes here.
  

  Results. The results section text goes here.
  

  Discussion. The discussion section text goes here.