Continuously combined hormone replacement therapy and bone turnover: the influence of dydrogesterone dose, smoking and initial degree of bone turnover. - Valk-de Roo,G.W.; Netelenbos,J.C.; Peters-Muller,I.RA.; Voetberg,G.A.; van de Weijer,P.HM.; Bouman,A.A.; Popp-Snijders,C.P.; Kenemans,P. (Maturitas, 1997)