Acknowledgments
We are grateful to the hospital and clinics, the Faculty of Medical Sciences of the State University of Campinas, Sao Paulo, Brazil, and Japan Science and Technology (JST), the Japan International Cooperation Agency (JICA) and the Science and Technology Research Partnership for Sustainable Development (SATREPS) for the financial support (grant no. UNICAMP 02P-29548-09).
Declaration of interest: The authors report no conflicts of interest.