There are a lot of medical reference apps out there. Many of these existing solutions give your users access to full PDF articles you already subscribe too. These companies all have different ways to provide ‘1-click PDF access’. PubMed and Google Scholar will also also integrate with your institution’s...
All clinical studies can be distilled down to finding the relationship between predictor variables and a response variables. I say relationship because, in general, causation is a difficult endeavour, especially in medicine where there is so much variability.