Tamoxifen and estrogen lower circulating lipoprotein(a) concentrations in healthy postmenopausal women - Shewmon, D A; Stock, J L; Rosen, C J; Heiniluoma, K M; Hogue, M M; Morrison, A; Doyle, E M; Ukena, T; Weale, V; Baker, S (Arterioscler Thromb, 1994)