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We would like to thank Dr Park1 for his comments on our work and for bringing these issues to our attention and of …
Funding This work was supported by FAPESP, grant number 98/11205, 06/53772-7 and CNPq 03763/2010-8.
Competing interests None.
Ethics approval The Ethics Committee at the Instituto de Ciências Biomédicas Universidade de São Paulo.
Provenance and peer review Commissioned; internally peer reviewed.