PEN is a dynamic knowledge translation subscription service developed by Dietitians of Canada with input from leaders in dietetic practice, knowledge translation and technology.
PubMed comprises more than 22 million citations for biomedical literature from MEDLINE, life science journals, and online books.
PubMed Central is an electronic archive for over 130+ full text journals, offering unrestricted access to its contents. Every full text article in PubMed Central has a corresponding entry in PubMed. PubMed Central contains all the peer-reviewed primary research articles from every participating journal. Other journal content, such as essays, reviews, and letters, is made available at the discretion of the publisher.