Refine My Results

Creation Date 

1. Before 1957  (30,755)
2. 1957 To 1973  (115,955)
3. 1974 To 1990  (226,642)
4. 1991 To 2008  (329,897)
5. After 2008  (602,930)
6. More options 

New Records 

1. New From Last Week  (512)
2. New From Last Month  (4,325)
3. New From Last 3 Month  (15,233)
4. More options 

Resource Type 

1. Articles  (1,098,663)
2. Newsletter Articles  (84,996)
3. Newspaper Articles  (56,917)
4. magazinearticle  (26,604)
5. Reports  (10,734)
6. Book Chapters  (5,378)
7. Web Resources  (4,978)
8. Reviews  (4,557)
9. Thesises (postgraduate)  (3,946)
10. Books  (2,845)
11. Conference Proceedings  (1,316)
12. Text Resources  (976)
13. References  (420)
14. Datasets  (247)
15. Journals  (214)
16. Government Documents  (152)
17. Archival Material / Manuscripts  (138)
18. Videos  (72)
19. Other  (61)
20. Images  (58)
21. More options 

Subject 

1. Pregnancy  (1,221,479)
2. Female  (945,100)
3. Humans  (798,290)
4. Science & Technology  (665,045)
5. Life Sciences & Biomedicine  (644,754)
6. Adult  (307,406)
7. Animals  (206,768)
8. Obstetrics & Gynecology  (187,455)
9. Infant, Newborn  (181,948)
10. Biological And Medical Sciences  (179,182)
11. Male  (179,009)
12. Medical Sciences  (137,375)
13. Womens Health  (120,212)
14. Adolescent  (88,589)
15. Risk Factors  (83,178)
16. Gynecology. Andrology. Obstetrics  (74,689)
17. Gestational Age  (69,113)
18. General & Internal Medicine  (67,488)
19. Medicine, General & Internal  (65,657)
20. Rats  (62,030)
21. More options 

Databases 

1. MEDLINE  (953,587)
2. ProQuest Central  (504,520)
3. Geneva Foundation Free Medical Journals at publisher websites  (231,515)
4. PubMed Central  (192,981)
5. DOAJ Directory of Open Access Journals  (178,748)
6. ROAD: Directory of Open Access Scholarly Resources  (118,257)
7. HighWire Press (Free Journals)  (91,624)
8. Wiley_OA刊  (45,675)
9. ProQuest One Psychology  (41,674)
10. Springer_OA刊  (32,656)
11. Taylor & Francis Open Access Journals  (19,877)
12. Journals@Ovid Open Access Journal Collection Rolling  (14,952)
13. Open Access: Nature Open Access  (12,366)
14. PLoS (Open access)  (11,106)
15. Open Access: Oxford University Press Open Journals  (8,579)
16. IngentaConnect Open Access  (8,221)
17. JSTOR Early Journal Content Free  (6,263)
18. Open Access: African Journals Online  (6,039)
19. Coronavirus Research Database  (6,034)
20. SciELO  (5,795)
21. More options 

Language 

1. English  (1,127,903)
2. Japanese  (80,205)
3. German  (36,369)
4. French  (33,611)
5. Russian  (20,023)
6. Spanish  (18,632)
7. Italian  (12,112)
8. Portuguese  (10,395)
9. Polish  (9,252)
10. Chinese  (8,143)
11. Czech  (5,455)
12. Bulgarian  (3,175)
13. Dutch  (3,170)
14. Danish  (2,576)
15. Swedish  (2,495)
16. Norwegian  (2,340)
17. Hungarian  (2,124)
18. Korean  (1,560)
19. Finnish  (1,219)
20. Ukrainian  (1,165)
21. More options 

Journal Title 

1. Acta Obstetricia Et Gynecologica Scandinavica  (7,102)
2. American Journal Of Obstetrics And Gynecology  (26,535)
3. Bjog : An International Journal Of Obstetrics And Gynaecology  (8,696)
4. Bmj  (11,217)
5. British Medical Journal  (8,755)
6. Fertility And Sterility  (9,394)
7. Obstetrics And Gynecology  (16,627)
8. Plos One  (10,087)
9. Prenatal Diagnosis  (7,517)
10. The Lancet  (10,425)
11. More options