COVID-19 crisis: Applying the principles of lean manufacture within a Hemodialysis Unit José Juan Ribés Cruz; Esther Bea Reyes; José Graña Fandos; Yolanda Blanco Mateos; María Aparicio Aliaga; Yaiza Aznar Artiles; Belén Alemany Sánchez; Martina Mravcová; Rosa Borrás Vila; Boris Marcelo Gonzales Candia; Igor Romaniouk Jakovler; Miguel Ángel Candel Rosell;