Persistent gestational trophoblastic disease: Results of MEA (methotrexate, etoposide and dactinomycine) as first-line chemotherapy in hight risk disease and EA (etoposide and dactinomycine) as second-line therapy for low risk disease. - Dobson,L.S.; Lorigan,P.C.; Coleman,R.E.; Hancock,B.W. (Brit J Cancer, 2000)