1. Section of Digestive Diseases; Department of Internal Medicine; Yale University; New Haven CT
2. Department of Physiology and Biophysics; Federal University of Minas Gerais; Belo Horizonte-Minas Gerais Brazil
3. School of Engineering, Federal University of Minas Gerais; Belo Horizonte-Minas Gerais Brazil
4. René Rachou Research Center, Oswaldo Cruz Foundation; Belo Horizonte-Minas Gerais Brazil
5. Department of Morphology; Federal University of Minas Gerais; Belo Horizonte-Minas Gerais Brazil
6. Department of Biochemistry and Immunology; Federal University of Minas Gerais; Belo Horizonte-Minas Gerais Brazil
7. Howard Hughes Medical Institute; Boston MA