1. Department of Obstetrics and Gynecology, Nagoya City University, Graduate School of Medical Sciences, Nagoya, Aichi 467‑8601, Japan
2. Department of Occupational and Environmental Health, Nagoya City University, Graduate School of Medical Sciences, Nagoya, Aichi 467‑8601, Japan
3. Department of Pediatrics and Neonatology, Nagoya City University, Graduate School of Medical Sciences, Nagoya, Aichi 467‑8601, Japan