Emergency Medicine 3 (2)

WebMD LLC, New York, USA

International Society of Arthroscopy, Knee Surgery and Orthopedic Sports Medicine (2)

International Society of Arthroscopy, Knee Surgery and Orthopedic Sports Medicine, San Ramon, California, USA

Guidelines for the Management of Severe Traumatic Brain Injury (2)

Brain Trauma Foundation, American Association of Neurological Surgeons and the Congress of Neurological Surgeons, New York, USA, 2016

Mayo Clinic Medical Professional Video Center (2)

Mayo Clinic, Rochester, MN, USA

Medical Images and Illustrations (2)

Diosphere Ltd t/a Medical Images, Wilmington, USA

Medical Image Database (2)

MedPix,  U.S. National Library of Medicine, Bethesda, USA

The American Board of Thoracic Surgery (2)

The American Board of Thoracic Surgery, Chicago, IL, USA

The Cardiothoracic Surgery Network (2)

CTSNET, Inc., Chicago, IL, USA

The Journal of Trauma and Acute Care Surgery (2)

Journal, American Association for the Surgery of Trauma, Chicago, IL, USA, free summaries, paid full-text papers

The Society of Thoracic Surgeons (2)

The Society of Thoracic Surgeons, Chicago, IL, USA

Thoracic Surgery Directors Association (2)

Thoracic Surgery Directors Association, Chicago, IL, USA