Today, physicians have access to a rich selection of knowledge sources, including those that are publicly available, such as PubMed and MedlinePlus from the National Library of Medicine (NLM), the Centers for Disease Control and Prevention Vaccines (CDC) and international travel information, the Agency for Healthcare Research and Quality (AHRQ) National Guideline Clearinghouse, and those produced by commercial vendors such as UpToDate, Micromedex, and electronic textbooks , all accessible from any web browser at any time. Some EHR systems are proactive and present brief informational information as a paragraph adjacent to the order item chosen by the physician. EHRs can also pull literature, textbooks, or other sources of information relevant to a particular clinical situation through an Info button and present that information to the clinician on the fly (Del Fiol et al. 2012), an approach encouraged by CMS MU2 regulations ( Final rule: CMS 2012). Search queries. Eknygos.lsmuni.it: The most effective time to provide access to knowledge resources is when the doctor considers decisions or orders.