[1] Univ Cantabria, Inst Invest Valdecilla IDIVAL, Hosp Marques Valdecilla, Serv Med Interna, Santander, Spain
[2] Univ Salamanca, Inst Invest Biomed Salamanca IBSAL, Serv Microbiol & Parasitol, Complejo Asistencial Univ Salamanca CAUSA,CSIC, Salamanca, Spain
[3] Univ Salamanca, Dept Ciencias Biomed & Diagnost, Salamanca, Spain
[4] Univ Salamanca, Ctr Invest Enfermedades Tropicales Univ Salamanca, Complejo Asistencial Univ Salamanca CAUSA,Secc En, Inst Invest Biomed Salamanca IBSAL,Ctr Invest Enf, Salamanca, Spain