text: Field-specific reporting 
  
  Please select the one below that is the best fit for your research. If you are not sure, read the appropriate sections before making your selection. 
  
  Life sciences  Behavioural & social sciences   Ecological, evolutionary & environmental sciences 
  
  For a reference copy of the document with all sections, see nature.com/documents/nr-reporting-summary-flat.pdf 
  
  Life sciences study design 
  
  All studies must disclose on these points even when the disclosure is negative. 