DOI: https://doi.org/10.18597/rcog.1993
DOI: https://doi.org/10.18597/rcog.1995
DOI: https://doi.org/10.18597/rcog.1997
DOI: https://doi.org/10.18597/rcog.2000
DOI: https://doi.org/10.18597/rcog.2001
DOI: https://doi.org/10.18597/rcog.2002
DOI: https://doi.org/10.18597/rcog.2003