- Systemic methotrexate therapy versus laparoscopic salpingostomy in tubal pregnancy. Part II. Patient preferences for systemic methotrexate. Nieuwkerk, P.T., Hajenius, P.J., Van der Veen, F., Ankum, W.M., Wijker, W., Bossuyt, P.M. Fertil. Steril. (1998)