5. ACKNOWLEDGEMENTS
The authors thank all mothers who participated in this study, as well as the staff members of Tokyo University Hospital and Bunkyo-ku Public Health Centers where the study was conducted. We would also like to thank the exercise instructors, Ms. Mako Yoshioka and her col- leagues. Our appreciation also goes to Dr. Stuart Gilmour from The University of Tokyo, for advice on the English text. This study was part of a research project funded by a grant from Japan Society for the Pro- motion of Science (Grant-in-Aid for Scientific Research (B), 2006- 2008, No. 17390577).