1. Department of Pediatrics, Graduate School of Medical Sciences; Kyushu University; Fukuoka 812-8582 Japan
2. Department of Human Genetics; Yokohama City University School of Medicine; Yokohama 236-0004 Japan
3. Section of Pediatrics, Department of Medicine; Fukuoka Dental College; Fukuoka 814-0193 Japan
4. Department of Molecular and Human Genetics; Baylor College of Medicine; Houston 77030 TX USA