1. Department of Emergency Medicine, Department of Biostatistics The University of Texas Health Science Center at Houston Houston Texas USA
2. Department of Epidemiology, Human Genetics & Environmental Sciences, School of Public Health The University of Texas Health Science Center at Houston Houston Texas USA
3. Department of Emergency Medicine, McGovern Medical School The University of Texas Health Science Center at Houston Houston Texas USA
4. Department of Medicine, Division of Critical Care Medicine The University of Texas Health Science Center at Houston Houston Texas USA
5. Department of Emergency Medicine The Ohio State University Columbus Ohio USA