Doing a Systematic Review: A Student's Guide
Second Edition
Chapter 9. Writing My Discussion and Conclusions
Explore the wealth of resources available across the web. Here are some good places to start.
Further information about writing the ‘discussion’ section of a systematic review
http://libguides.usc.edu/writingguide/discussion
Further information about critical appraisal
https://library.medschl.cam.ac.uk/research-support/critical-appraisal-resources