British Medical Journal (BMJ) is a United Kingdom based company and many of the recommendations for care reflect UK practices and cannot be implemented in the United States' health systems. However, this sources does provide excellent science-based information on etiology, diagnosis, and monitoring for a broad variety of diseases and conditions.
BMJ Best Practice
Evidence-based overviews of medical topics, continually updated. Includes calculators and patient handouts. Create personal account to claim CME credits.