2224-7920 2224-7920 S2224-79202021000200102 Cuba Cuba 00 08 2021 00 08 2021 33 2 102 106 2020 b 32 3 3 57-69 2020 a 32 1 1 113-22 2020 31 1 1 98-109 2018 36 8 8 502-6 2018 2 1 1