Footnotes

• Twitter Follow Brian Alper at @BrianAlperMD

• Competing interests BSA is the founding editor of DynaMed and an employee of its publisher, EBSCO and seeks collaboration with multiple entities which produce products named in the original article. RBH is the founding editor of ACP Journal Club and an employee of McMaster University, which provides evidence services for a number of clinical knowledge resources including ACP Journal Club, ACP JournalWise, BMJ Best Practice, DynaMed, EBMeDS, EvidenceUpdates, ACCESSSS and MacPLUS Federated Search.

• Provenance and peer review Not commissioned; internally peer reviewed.