2Patel BG, Lessey BA. Clinical assessment and management of the endometrium in recurrent early pregnancy loss. Semin Reprod Med,2011,29(6) :491-506.
3Fiegler P, Katz M, Kaminski K, et al. Clinical value of a single serum CA-125 level in women with symptoms of imminent abortion during the first trimester of pregnancy. J Reprod Med, 2003,48 (12) :982-988.
4Chung K, Mien R. The use of serial human chorionic gonadotropin levels to establish a viable or a nonviable pregnancy. Semin Reprod Med,2008,26(5 ) :383-387.
5Seeber BE, Sammel MD, Guo W, et al. Application of redefined human chorionic gonadotropin curves for the diagnosis of women at risk for ectopic pregnancy. Fertil Steri1,2006,86 (2) :454-459.
6Duan L, Yan D, Zeng W, et al. Effect of progesterone treatment due to threatened abortion in early pregnancy for obstetric and perinatal outcomes. Early Hum Dev,2010,86( 1 ) :4143.
7E1 Bishry G, Ganta S. The role of single serum progesterone measurement in conjunction with beta hCG in the management of suspected ectopic pregnancy. J Obstet Gynaecol, 2008,28 ( 4 ) : 413-417.