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3. Association of the type and time of insemination within the menstrual cycle with the human sex ratio at birth. Guerrero R N Engl J Med; 1974 Nov; 291(20):1056-9. PubMed ID: 4412107 [No Abstract] [Full Text] [Related]
4. Gender of infants conceived on different days of the menstrual cycle. Harlap S N Engl J Med; 1979 Jun; 300(26):1445-8. PubMed ID: 449885 [TBL] [Abstract][Full Text] [Related]
5. More about natural family planning. Gallagher J Aust Fam Physician; 1983 Nov; 12(11):786-92. PubMed ID: 6667188 [TBL] [Abstract][Full Text] [Related]
6. Natural family planning and sex selection: fact or fiction? Gray RH Am J Obstet Gynecol; 1991 Dec; 165(6 Pt 2):1982-4. PubMed ID: 1836712 [TBL] [Abstract][Full Text] [Related]
7. Sex ratio: a statistical association with the type and time of insemination in the menstrual cycle. Guerrero R Int J Fertil; 1970; 15(4):221-5. PubMed ID: 5487546 [TBL] [Abstract][Full Text] [Related]
8. Sex ratio associated with timing of insemination and length of the follicular phase in planned and unplanned pregnancies during use of natural family planning. Gray RH; Simpson JL; Bitto AC; Queenan JT; Li C; Kambic RT; Perez A; Mena P; Barbato M; Stevenson W; Jennings V Hum Reprod; 1998 May; 13(5):1397-400. PubMed ID: 9647580 [TBL] [Abstract][Full Text] [Related]
9. Hormonal and behavioral determinants of the secondary sex ratio. Martin JF Soc Biol; 1995; 42(3-4):226-38. PubMed ID: 8738548 [TBL] [Abstract][Full Text] [Related]
10. Timing of sexual intercourse in relation to ovulation. Effects on the probability of conception, survival of the pregnancy, and sex of the baby. Wilcox AJ; Weinberg CR; Baird DD N Engl J Med; 1995 Dec; 333(23):1517-21. PubMed ID: 7477165 [TBL] [Abstract][Full Text] [Related]
11. Spontaneous abortion and aging of human ova and spermatozoa. Guerrero R; Rojas OI N Engl J Med; 1975 Sep; 293(12):573-5. PubMed ID: 1152892 [TBL] [Abstract][Full Text] [Related]
12. Natural family planning. New drug-free, device-free birth-control methods everybody's talking about. Aguilar N Fam Circle; 1978 Mar; ():T2. PubMed ID: 12339767 [TBL] [Abstract][Full Text] [Related]
13. A second look at natural family planning. Lolarga E Initiatives Popul; 1983; 7(1):2-12. PubMed ID: 12265791 [TBL] [Abstract][Full Text] [Related]
14. [The risks of the natural family planning methods]. Zufferey MM Ther Umsch; 1986 May; 43(5):417-24. PubMed ID: 3726778 [TBL] [Abstract][Full Text] [Related]
15. Characteristics of natural conceptual cycles occurring in a prospective study of sex preselection: fertility awareness symptoms, hormone levels, sperm survival, and pregnancy outcome. France JT; Graham FM; Gosling L; Hair P; Knox BS Int J Fertil; 1992; 37(4):244-55. PubMed ID: 1354212 [TBL] [Abstract][Full Text] [Related]
16. Type and time of insemination within the menstrual cycle and the human sex ratio at birth. Guerrero R Stud Fam Plann; 1975 Oct; 6(10):367-71. PubMed ID: 1209694 [TBL] [Abstract][Full Text] [Related]
18. Coitus and contraception: the utility of data on sexual intercourse for family planning programs. Blanc AK; Rutenberg N Stud Fam Plann; 1991; 22(3):162-76. PubMed ID: 1949099 [TBL] [Abstract][Full Text] [Related]
19. Natural family planning. Davis MS NAACOGS Clin Issu Perinat Womens Health Nurs; 1992; 3(2):280-90. PubMed ID: 1596436 [TBL] [Abstract][Full Text] [Related]
20. 'Natural' methods of family planning. Jones M Fertil Contracept; 1978 Oct; 2(4):55-8. PubMed ID: 12260793 [TBL] [Abstract][Full Text] [Related] [Next] [New Search]