The medical management of ectopic pregnancy: a meta-analysis comparing "single dose" and "multidose" regimens.
Barnhart KT, Gosman G, Ashby R, Sammel M. The medical management of ectopic pregnancy: a meta-analysis comparing "single dose" and "multidose" regimens. Obstet Gynecol. 2003 Apr; 101(4):778-84.