Unfortunately it’s behind a paywall. Odd choice by the journal, given the subject.
UPDATE on May 9: JAMA Internal Medicine has decided to move the article in front of the paywall, offering it free online to readers for 6 months. This is apparently in response to reader comments about the previous restriction. You can access it at:
One free work-around if you don’t have a subscription or access to one: register for the JAMA Network Reader app – http://app.jamanetwork.com/ – and gain free access to this and more JAMA journal content.