1134-8046 1134-8046 S1134-80462021000200007 10.20986/resed.2021.3906/2021 Spain Spain 00 02 2021 00 02 2021 28 1 7 8 1 2020 34 3 3 553-60 2 2020 21 7 7 1331-46 3 2001 52 397-422 4 2018 19 12 12 2398-407 5 2021 162 2 2 503-13