1. Sowmi Pediatric Heart Centre, Swasthik Fetal Heart Unit, Tirunelveli, Tamil Nadu, India (B.K.).
2. Fetal Cardiology Division, Department of Paediatric Cardiology, Amrita institute of Medical Sciences and Research Centre, Kochi, Kerala, India (B.K.).
3. Department of Pediatrics, Sowmi Pediatric Heart Centre, Swasthik Fetal Heart Unit, Tirunelveli, Tamil Nadu, India (S.V.).