D. Steffens

A 12-month evaluation of the CMA-containing oral contraceptive Belara: efficacy, tolerability and anti-androgenic properties.

G. Schramm, D. Steffens, 2003, Contraception.

A comparative randomized trial on the impact of two low-dose oral contraceptives on ovarian activity, cervical permeability, and endometrial receptivity.

W. Rossmanith, G. Schramm, D. Steffens, 1997, Contraception.

Contraceptive Efficacy and Tolerability of Chlormadinone Acetate 2mg/ Ethinylestradiol 0.03mg (Belara®)

G. Schramm, D. Steffens, 2002 .

[Comparative study on ovarian activity cycle stability and tolerance during administration of two low-dose oral contraceptives]

W. Rossmanith, S. Gasser, B. Thun, 1997 .