Dorreen, M. S., Pennington, G. W., Millar, D. R., Hill, A. S., & Neal, F. E. (1998). Results of Low-Dose Methotrexate Treatment of Persistent Gestational Trophoblastic Disease in Sheffield 1980–1987. Acta Oncologica, 27(5), 551–556. https://doi.org/10.3109/02841868809093587