Why read papers at all?
Searching the literature
Getting your bearings: what is this paper about?
Assessing methodological quality
Statistics for the non-statistician
Papers that report drug trials
Papers that report diagnostic or screening tests
Papers that summarise other papers (systematic reviews and meta-analyses)
Papers that tell you what to do (guidelines)
Papers that tell you what things cost (economic analyses)
Papers that go beyond numbers (qualitative research)
Papers that report questionnaire research
Getting evidence into practice.
How to read a paper : the basics of evidence-based medicine by Trisha Greenhalgh. ISBN 9781405139762. Published by BMJ Books/Blackwell Pub. in 2006. Publication and catalogue information, links to buy online and reader comments.