全文获取类型
| 收费全文 | 876404篇 |
| 免费 | 49846篇 |
| 国内免费 | 1319篇 |
学科分类
| 医药卫生 | 927569篇 |
出版年
| 2019年 | 5488篇 |
| 2018年 | 29160篇 |
| 2017年 | 22921篇 |
| 2016年 | 25785篇 |
| 2015年 | 8458篇 |
| 2014年 | 11052篇 |
| 2013年 | 16156篇 |
| 2012年 | 27281篇 |
| 2011年 | 41932篇 |
| 2010年 | 30976篇 |
| 2009年 | 23130篇 |
| 2008年 | 38923篇 |
| 2007年 | 42614篇 |
| 2006年 | 22428篇 |
| 2005年 | 22542篇 |
| 2004年 | 23282篇 |
| 2003年 | 23188篇 |
| 2002年 | 20847篇 |
| 2001年 | 36586篇 |
| 2000年 | 37288篇 |
| 1999年 | 30531篇 |
| 1998年 | 8078篇 |
| 1997年 | 6859篇 |
| 1996年 | 7044篇 |
| 1995年 | 6725篇 |
| 1994年 | 6194篇 |
| 1993年 | 5644篇 |
| 1992年 | 23003篇 |
| 1991年 | 23004篇 |
| 1990年 | 22432篇 |
| 1989年 | 22152篇 |
| 1988年 | 20086篇 |
| 1987年 | 19456篇 |
| 1986年 | 18493篇 |
| 1985年 | 17333篇 |
| 1984年 | 12714篇 |
| 1983年 | 10762篇 |
| 1982年 | 5951篇 |
| 1979年 | 11524篇 |
| 1978年 | 8136篇 |
| 1977年 | 6836篇 |
| 1976年 | 6604篇 |
| 1975年 | 7276篇 |
| 1974年 | 8520篇 |
| 1973年 | 8145篇 |
| 1972年 | 7659篇 |
| 1971年 | 7127篇 |
| 1970年 | 6896篇 |
| 1969年 | 6326篇 |
| 1968年 | 5796篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
1.
2.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
3.
4.
M. Iachina P.M. Ljungdalh R.G. Sørensen L. Kaerlev J. Blaakær O. Trosko N. Qvist B.M. Nørgård 《Clinical oncology (Royal College of Radiologists (Great Britain))》2019,31(2):115-123
Aims
To examine the influence of pre-existing psychiatric disorder on the choice of treatment in patients with gynaecological cancer.Materials and methods
The analyses were based on all patients who underwent surgical treatment for endometrial, ovarian or cervical cancer who were registered in the Danish Gynecological Cancer Database in the years 2007–2014 (3059 patients with ovarian cancer, 5100 patients with endometrial cancer and 1150 with cervical cancer). Logistic regression model and Cox regression model, adjusted for relevant confounders, were used to estimate the effect of pre-existing psychiatric disorder on the course of cancer treatment. Our outcomes were (i) presurgical oncological treatment, (ii) macroradical surgery for patients with ovarian cancer, (iii) radiation/chemotherapy within 30 days and 100 days after surgery and (iv) time from surgery to first oncological treatment.Results
In the group of patients with ovarian cancer, more patients with a psychiatric disorder received macroradical surgery versus patients without a psychiatric disorder, corresponding to an adjusted odds ratio of 1.24 (95% confidence interval 0.62–2.41) and the chance for having oncological treatment within 100 days was odds ratio = 1.26 (95% confidence interval 0.77–2.10). As for patients with endometrial cancer, all outcome estimates were close to unity. The adjusted odds ratio for oncological treatment within 30 days after surgery in patients with cervical cancer with a history of psychiatric disorder was 0.20 (95% confidence interval 0.03–1.54).Conclusions
We did not find any significant differences in the treatment of ovarian and endometrial cancer in patients with pre-existing psychiatric diagnoses. When it comes to oncological treatment, we suggest that increased attention should be paid to patients with cervical cancer having a pre-existing psychiatric diagnosis. 相似文献5.
6.
I. Fouzas C. Papanikolaou G. Katsanos N. Antoniadis N. Salveridis K. Karakasi S. Vasileiadou A. Fouza E. Mouloudi G. Imvrios V. Papanikolaou 《Transplantation proceedings》2019,51(2):416-420
Aims
Variations of the anatomy of donor hepatic arteries increase the number of arterial anastomoses during liver transplantation and, possibly, the incidence of hepatic artery thrombosis (HAT). In this study, we describe the arterial anatomic variations in liver grafts procured and transplanted by a single center in Greece, the techniques of arterial anastomosis, and their effect on the incidence of early HAT.Materials and Methods
From January 2013 to December 2017, the arterial anatomy of 116 grafts procured for liver transplantation were recorded, as well as the technique of arterial anastomosis and the incidence of early hepatic artery thrombosis (HAT <30 days).Results
A single hepatic artery was recorded in 72.41% of the procured grafts, an aberrant left hepatic artery (accessory or replaced) in 18 grafts (15.52%), and an aberrant right hepatic artery (accessory or replaced) in 17 grafts (14.66%), while other variations were observed in less than 1% of the procured livers. Of the 116 primary liver transplantations, 6 patients (5.17%) developed early HAT <30 days. Two of these patients (1.72%) had 1 anastomosis of the hepatic artery and 4 (3.45%) had 2 anastomoses due to anatomic variations.Conclusions
Anatomic variations of the hepatic artery in liver grafts is a common finding and increase the incidence of early HAT but not to a degree to make these grafts unusable. 相似文献7.
8.
N. V. Bashmakova G. N. Chistiakova I. A. Gazieva Y. M. Trapeznikova D. O. Mazurov 《Gynecological endocrinology》2015,31(10):31-33
AbstractThis study was undertaken to compare the concentrations of pro- and anti-angiogenic growth factors, nitric oxide (NO) stable metabolites in maternal serum and embryonic left ventricular (LV) isovolumic relaxation time (IRT, ms) during the first trimester in two groups of women: with pregnancy conceived by assisted reproductive technologies (ART, n?=?39) and normally conceived (control group, n?=?68) pregnancy. The concentration of vasoconstrictor endothelin 1 was 45.5 times more in ART than in control group. On the contrary, the concentrations of NO stable metabolites in ART were 1.9 times less than in control women. The assessment of angiogenic suppressors in ART women demonstrates the decrease in s-endoglin concentration was 1.6 times and in soluble receptor to vascular endothelial growth factor concentration was 2.0 times in comparison with control group. There was a significant increase in LV IRT in ART embryos in comparison to control ones. These data suggest significant changes in pro- anti-angiogenic factors balance and increase in vascular impedance in ART-conceived embryos. 相似文献
9.
10.
