1. Division of Neonatology; Maternal and Perinatal Center; Toyama University Hospital; Toyama Japan
2. The Russell H. Morgan Department of Radiology and Radiological Science; The Johns Hopkins University School of Medicine; Baltimore MD
3. Laboratory of Clinical Cognitive Neuroscience; Institute of Liberal Arts and Science; Kanazawa University; Kakuma-machi Kanazawa Ishikawa Japan
4. Department of Pediatrics; Faculty of Medicine; University of Toyama; Toyama Japan