An excellent feed reader/aggregator for researchers, doctors, scientists – Read by QxMD Review

Track articles from any journal/publication or even based on keywords. Add to your own collection, or follow one of the many wonderful topical collections that others have published. Gather your PDFs easily as you go. This is the best app I've found in a long time, and I'm sorry that I somehow missed it in many previous searches.
Review by parables_bk on Read by QxMD.