JAMA Internal Medicine – Improving Health and Health Care

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Research

Association of Sleep Duration and Variability With Body Mass Index
Stuti J. Jaiswal, MD, PhD; et al.

Research Letter
online first
Stuti J. Jaiswal, MD, PhD; et al.
Out-of-Pocket Costs for Novel Guideline-Directed Diabetes Therapies Under Medicare Part D
Colette DeJong, MD; et al.

Research Letter
online first
Colette DeJong, MD; et al.
Effect of Recombinant Human Granulocyte Colony–Stimulating Factor for Patients With COVID-19 and Lymphopenia
Lin-ling Cheng, MD; et al.

Original Investigation
online first free access has active quiz
Lin-ling Cheng, MD; et al.

Invited Commentary
Clinical Outcomes in Young US Adults Hospitalized With COVID-19
Jonathan W. Cunningham, MD; et al.

Research Letter
online first free access has active quiz
Jonathan W. Cunningham, MD; et al.

Editor's Note
Representation of Older Adults in Cardiovascular Disease Trials Since the Inclusion Across the Lifespan Policy
Michael G. Nanna, MD; et al.

Research Letter
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Michael G. Nanna, MD; et al.

Editor's Note

Opinion

Severe COVID-19 Infections—Knowledge Gained and Remaining Questions
Lieuwe D. J. Bos, MD, PhD; et al.

Editorial
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Lieuwe D. J. Bos, MD, PhD; et al.
Affordable Care Act Returns to the Supreme Court
Marcia M. Boumil, JD, LLM; et al.

Viewpoint
online first
Marcia M. Boumil, JD, LLM; et al.
A Solution for Guideline Overkill—More Guidelines or Shared Understanding?
Raj Mehta, MD; et al.

Invited Commentary
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Raj Mehta, MD; et al.
Immune Stimulation With Recombinant Human Granulocyte Colony–Stimulating Factor for Coronavirus Disease 2019 (COVID-19)
Nuala J. Meyer, MD, MS; et al.

Invited Commentary
online first free access
Nuala J. Meyer, MD, MS; et al.
Regardless of Age, Obesity and Hypertension Increase Risks With COVID-19
Mitchell H. Katz, MD

Editor's Note
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Mitchell H. Katz, MD

Clinical Review & Education

Identifying Recommendations for Stopping or Scaling Back Unnecessary Services in Primary Care
Eve A. Kerr, MD, MPH; et al.

Review
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Eve A. Kerr, MD, MPH; et al.

Invited Commentary
Troubleshooting a Transcutaneous Pacemaker
Emily R. Cedarbaum, MD, MPH; et al.

Challenges in Clinical Electrocardiography
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Emily R. Cedarbaum, MD, MPH; et al.
Right Coronary Artery Vasospasm Presenting as Complete Atrioventricular Block
Anjali B. Thakkar, MD, MBA; et al.

Challenges in Clinical Electrocardiography

Anjali B. Thakkar, MD, MBA; et al.
Irregular Narrow Complex Tachycardia
Ravi Choxi, DO; et al.

Challenges in Clinical Electrocardiography

Ravi Choxi, DO; et al.
An Atypical Case of Vasovagal Cardioinhibitory Syncope in a Young Male Soldier
Elizabeth R. Doman, DO; et al.

Challenges in Clinical Electrocardiography
online first
Elizabeth R. Doman, DO; et al.