Signs and Symptoms, Respiratory

• NeuroTrials Research, Inc. — Atlanta, Georgia, United States
• Johns Hopkins Bayview Medical Center — Baltimore, Maryland, United States
• Doctors Community Hospital — Lanham, Maryland, United States

• Hospital Universitario Miguel Servet — Zaragoza, Spain

• Medical University of Graz — Graz, Styria, Austria

• Uniformed Services University of Health Sciences — Bethesda, Maryland, United States

• Charité Universitätsmedizin Berlin — Berlin, Germany
• Charité Universitätsmedizin — Berlin, Germany

• Dept. of anesthesiology and pain medicine, Dongguk University Ilsan Hospital — Goyang, Kyunggido, South Korea

• Dothan, Alabama, United States
• Mobile, Alabama, United States
• Jonesboro, Arkansas, United States
• Little Rock, Arkansas, United States

• Queen's University — Kingston, Ontario, Canada

• Addenbrookes Hospital — Cambridge, Cambs, United Kingdom

Not specified