Type Info Provider Full Text
publishers/providers full-text pdf publisher of information in url subscription/membership/fee required Atypon
publishers/providers free resource full-text online preference publisher of information in url Atypon
aggregators full-text online subscription/membership/fee required Ovid Technologies, Inc.
clinical trials free resource ClinicalTrials.gov
commentaries/discussion subscription/membership/fee required Faculty of 1000
patent databases free resource The Lens