[1] Ctr Invest Principe Felipe, Valencia, Spain
[2] INCLIVA Inst Invest Sanitaria, Valencia, Spain
[3] Hosp Clin Univ, Unidad Digest, Valencia, Spain
[4] Univ Politecn Valencia, Dept Estadist & Invest Operat Aplicadas & Calidad, Valencia, Spain
[5] Hosp Arnau Vilanova, Serv Digest, Valencia, Spain
[6] Univ Florida, Microbiol & Cell Sci Dept, Gainesville, FL USA
[7] Univ Valencia, Dept Patol, Valencia, Spain