[Disparity in the criteria for including patients with neonatal sepsis in scientific medical studies. Are we swimming in a sea without limits?]. - Reyna-Figueroa J; Yuri-Toala E; Ortiz-Ibarra FJ; Rodríguez-Ramírez E; Limón-Rojas AE (Anales de pediatria (Barcelona, Spain : 2003), 2006)