TABLE 1.

Terms in search 1 and search 2.

Oil and gas terms
Coal bed methane	Crude oil	Hydrofracking	Petroleum	Unconventional gas
Coal seam gas	Fracking	Natural gas	Shale	Unconventional oil
Coal bed methane	Hydraulic fracturing	Oil and gas	Tight oil
Reproduction terms
Abortion	Epidydymis	Luteinization	Parturition	Sertoli
Acrosome	Estrogen	Luteolysis	Paternal age	Sertoli cell-only syndrome
Adnexa	Estrous	Lymphnagiogenesis	Penile	Sex
Adrenarch	Estrus	Maternal	Penile erection	Sex characteristics
Androgen	Fecundity	Maternal age	Penis	Sex determination
Andropause	Fertile	Maternal-fetal exchange	Perimenopause	Sex differentiation
Anestrus	Fertility	Menarche	Peripartum	Sexual development
Anogenital	Fertilization	Menopause	Placenta	Sexual maturation
Anovulation	Fetal development	Menstrual	Placentation	Sperm
Aspermia	Fetal movement	Menstruation	Postmenopause	Sperm capacitation
Asthenozoospermia	Fetal organ	Metestrus	Postpartum	Sperm maturation
Birth	Fetal organ maturity	Miscarriage	Pregnancy	Sperm transport
Birth rate	Fetal viability	Multiple pregnancy	Pregnancy loss	Sperm-ovum interaction
Breech	Fetal viability	Musculoskeletal development Pregnancy maintenance		Spermatazoa
Bulbourethral glands	Fetal weight	Neurogenesis	Pregnancy outcome	Spermatic cord
Cementogenesis	Follicular	Neurulation	Pregnancy rate	Spermatogenesis
Cervical	Follicular	Obstetric	Premenopause	Still birth
Cervix	Folliculara atresia	Odontogenesis	Prenatal nutritional physiological phenomena	Subfertility
Climacteric	Gametogenesis	Oligospermia	Proestrus	Superfetation
Coitus	Gastrulation	Oogenesis	Progesterone	Superovulation
Contraception	Genitalia	Organogenesis	Prostate	Term birth
Contraception behavior	Germ cell	Orgasm	Psuedopregnancy	Testes
Corpus luteum	Gestational age	Ovarian reserve	Puberty	Testis
Dentinogenesis	Gonads	Ovary	Puberty	Trimesters
Diestrus	Gravidity	Oviparity	Reproduction	Uterus
Ectogenesis	Infertility	Oviposition	Reproductive	Vagina
Ejaculation	Insemination	Ovoviviparity	Reproductive behavior	Vas deferens
Ejaculatory ducts	Lactation	Ovulation	Reproductive physiologic processes	Vitellogenesis
Embryonic and fetal development	Lacteal elimination	Ovulation inhibition	Reproductive physiological phenomena	Viviparity
Embryonic development	Live birth	Ovum	Scrotum	Vulva
Embryonic induction	Luteal	Parity	Seminal vesicles