全文获取类型
收费全文 | 747154篇 |
免费 | 51760篇 |
国内免费 | 1443篇 |
专业分类
耳鼻咽喉 | 9611篇 |
儿科学 | 24581篇 |
妇产科学 | 18739篇 |
基础医学 | 116060篇 |
口腔科学 | 20436篇 |
临床医学 | 69823篇 |
内科学 | 142203篇 |
皮肤病学 | 16859篇 |
神经病学 | 53653篇 |
特种医学 | 26515篇 |
外国民族医学 | 77篇 |
外科学 | 107754篇 |
综合类 | 15563篇 |
现状与发展 | 2篇 |
一般理论 | 202篇 |
预防医学 | 56206篇 |
眼科学 | 17181篇 |
药学 | 56825篇 |
3篇 | |
中国医学 | 2425篇 |
肿瘤学 | 45639篇 |
出版年
2021年 | 6252篇 |
2019年 | 6196篇 |
2018年 | 8757篇 |
2017年 | 6802篇 |
2016年 | 7596篇 |
2015年 | 8476篇 |
2014年 | 11518篇 |
2013年 | 17270篇 |
2012年 | 23357篇 |
2011年 | 24535篇 |
2010年 | 14269篇 |
2009年 | 13426篇 |
2008年 | 22733篇 |
2007年 | 24466篇 |
2006年 | 24945篇 |
2005年 | 23439篇 |
2004年 | 22900篇 |
2003年 | 21674篇 |
2002年 | 20982篇 |
2001年 | 36687篇 |
2000年 | 37152篇 |
1999年 | 30736篇 |
1998年 | 8342篇 |
1997年 | 7061篇 |
1996年 | 7333篇 |
1995年 | 6975篇 |
1994年 | 6355篇 |
1993年 | 5876篇 |
1992年 | 23162篇 |
1991年 | 23116篇 |
1990年 | 22481篇 |
1989年 | 22242篇 |
1988年 | 20215篇 |
1987年 | 19561篇 |
1986年 | 18594篇 |
1985年 | 17450篇 |
1984年 | 12876篇 |
1983年 | 10917篇 |
1982年 | 6146篇 |
1979年 | 11623篇 |
1978年 | 8233篇 |
1977年 | 6941篇 |
1976年 | 6680篇 |
1975年 | 7338篇 |
1974年 | 8571篇 |
1973年 | 8201篇 |
1972年 | 7708篇 |
1971年 | 7153篇 |
1970年 | 6908篇 |
1969年 | 6335篇 |
排序方式: 共有10000条查询结果,搜索用时 15 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.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
7.
Is it possible to make a diagnosis of raw,heated, and baked egg allergy in children using cutoffs? A systematic review 下载免费PDF全文
8.
9.
10.
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