1. Department of Pediatrics Vanderbilt University Medical Center Nashville Tennessee USA
2. Vanderbilt Epidemiology PhD Program Vanderbilt University School of Medicine Nashville Tennessee USA
3. Molecular Biology Research Laboratory The University of Jordan School of Medicine Amman Jordan
4. Department of Pediatrics University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
5. Department of Biostatistics Vanderbilt University Medical Center Nashville Tennessee USA
6. Department of Pediatrics Al‐Bashir Hospital Amman Jordan
7. Department of Pathology and Microbiology and Forensic Medicine The University of Jordan School of Medicine Amman Jordan
8. Department of Pediatrics The University of Jordan School of Medicine Amman Jordan