1. Department of Population Family & Reproductive HealthJohns Hopkins Bloomberg School of Public HealthJohns Hopkins University Baltimore MD USA
2. Department of Mathematics and Department of Statistical Science Duke University Durham NC USA
3. Department of Biostatistics Johns Hopkins Bloomberg School of Public HealthJohns Hopkins University Baltimore MD USA
4. Center for Interdisciplinary Sleep Research and Education Johns Hopkins School of MedicineJohns Hopkins University Baltimore MD USA
5. Division of Maternal‐Fetal Medicine Department of Gynecology & Obstetrics Johns Hopkins School of MedicineJohns Hopkins University Baltimore MD USA
6. Division of Pulmonary and Critical Care Medicine Department of Medicine Johns Hopkins School of MedicineJohns Hopkins University Baltimore MD USA