DOI: https://doi.org/10.18597/rcog.1919
DOI: https://doi.org/10.18597/rcog.1920
DOI: https://doi.org/10.18597/rcog.1924
DOI: https://doi.org/10.18597/rcog.1928
DOI: https://doi.org/10.18597/rcog.1930
DOI: https://doi.org/10.18597/rcog.1932