1. Department of Internal Medicine, Baylor University Medical Center, Baylor Scott & White Health , Dallas, Texas , USA
2. Baylor Scott & White Research Institute , Dallas, Texas , USA
3. Department of Internal Medicine, Burnett School of Medicine at Texas Christian University (TCU) , Fort Worth, Texas , USA
4. Department of Internal Medicine, Texas A&M Health Science Center , Dallas, Texas , USA
5. Division of Infectious Diseases, Department of Internal Medicine, University of Nebraska Medical Center , Omaha, Nebraska , USA