title: [EVIDENCE 1 A WITH RECOMMENDATION A?, OR 1 ++ WITH RECOMMENDATION B? WHAT REALLY UNDERSTAND ABOUT THE LEVELS OF EVIDENCE AND GRADES OF RECOMMENDATION? PART I].
authors: Facultad de Ciencias de la Actividad Física, Universidad San Sebastián, Santiago (Chile).. kine.rae@gmail.com.
authors: Raúl
authors: R
authors: Aguilera-Eguía