DOI: https://doi.org/10.18597/rcog.1934
DOI: https://doi.org/10.18597/rcog.1937
DOI: https://doi.org/10.18597/rcog.1939
DOI: https://doi.org/10.18597/rcog.1945
DOI: https://doi.org/10.18597/rcog.1948
DOI: https://doi.org/10.18597/rcog.1952