全文获取类型
| 收费全文 | 305934篇 |
| 免费 | 17668篇 |
| 国内免费 | 444篇 |
专业分类
| 耳鼻咽喉 | 4358篇 |
| 儿科学 | 10421篇 |
| 妇产科学 | 10349篇 |
| 基础医学 | 45930篇 |
| 口腔科学 | 7817篇 |
| 临床医学 | 24712篇 |
| 内科学 | 57963篇 |
| 皮肤病学 | 6650篇 |
| 神经病学 | 21794篇 |
| 特种医学 | 12017篇 |
| 外国民族医学 | 43篇 |
| 外科学 | 48181篇 |
| 综合类 | 7803篇 |
| 现状与发展 | 1篇 |
| 一般理论 | 161篇 |
| 预防医学 | 20247篇 |
| 眼科学 | 7076篇 |
| 药学 | 21744篇 |
| 中国医学 | 798篇 |
| 肿瘤学 | 15981篇 |
出版年
| 2019年 | 2388篇 |
| 2018年 | 3803篇 |
| 2017年 | 2810篇 |
| 2016年 | 3228篇 |
| 2015年 | 3660篇 |
| 2014年 | 4800篇 |
| 2013年 | 7451篇 |
| 2012年 | 9472篇 |
| 2011年 | 9910篇 |
| 2010年 | 6380篇 |
| 2009年 | 5747篇 |
| 2008年 | 9071篇 |
| 2007年 | 9929篇 |
| 2006年 | 9789篇 |
| 2005年 | 9384篇 |
| 2004年 | 9077篇 |
| 2003年 | 8540篇 |
| 2002年 | 8149篇 |
| 2001年 | 13697篇 |
| 2000年 | 14035篇 |
| 1999年 | 11781篇 |
| 1998年 | 3149篇 |
| 1997年 | 2879篇 |
| 1996年 | 2724篇 |
| 1995年 | 2619篇 |
| 1994年 | 2412篇 |
| 1992年 | 8561篇 |
| 1991年 | 8681篇 |
| 1990年 | 8498篇 |
| 1989年 | 8308篇 |
| 1988年 | 7520篇 |
| 1987年 | 7266篇 |
| 1986年 | 6876篇 |
| 1985年 | 6679篇 |
| 1984年 | 4879篇 |
| 1983年 | 4215篇 |
| 1982年 | 2506篇 |
| 1979年 | 4511篇 |
| 1978年 | 3285篇 |
| 1977年 | 2784篇 |
| 1976年 | 2538篇 |
| 1975年 | 2865篇 |
| 1974年 | 3404篇 |
| 1973年 | 3392篇 |
| 1972年 | 3153篇 |
| 1971年 | 2994篇 |
| 1970年 | 2876篇 |
| 1969年 | 2627篇 |
| 1968年 | 2572篇 |
| 1967年 | 2419篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
1.
2.
3.
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4.
Yohei Tomaru Hiroshi Kamada Yuta Tsukagoshi Shogo Nakagawa Kenta Tanaka Ryoko Takeuchi Yuki Mataki Shumpei Miyakawa Masashi Yamazaki 《Journal of orthopaedic science》2019,24(1):159-165
Background
On April 1, 2016, the Ministerial ordinance was enforced, and musculoskeletal examination of the extremities was made mandatory. From 2008, the University of us started musculoskeletal direct examination. To expand the examination, from 2016, we started to use the marksheet-type questionnaire. This study aimed to report the results of a musculoskeletal examination and investigate the association between musculoskeletal examination and age/gender and reports the reliability of the collected questionnaire data.Methods
Direct musculoskeletal examination was performed in K school by 7 orthopedic surgeons. A marksheet-type screening questionnaire was distributed to all the elementary and junior high school students in Tsukuba and Hitachiomiya cities. The rates of abnormal findings for scoliosis, standing flexion, full squatting with the heels on the floor, general joint laxity, and standing on one leg, torticollis, and flat feet were calculated. We compared the results of the questionnaire and direct examination and calculated sensitivity, specificity, and odds ratio.Results
A total of 1844 students in K school had direct examination, and 22,494 questionnaires were able to correct in Tsukuba and Hitachiomiya cities. The rates of abnormal findings in direct examination/questionnaire in scoliosis, standing flexion, full squat, general joint laxity, standing on one leg, torticollis and flat foot were 18.7% (344/1842)/5.1% (1094/21441), 20.2% (372/1841)/26.6% (5817/22078), 6.2% (114/1832)/6.9% (1516/22101), 7.5% (1648/22252), 4.9% (1100/22077), 2.2% (31/1844)/1.2% (272/21687), and 12.5% (231/1842)/8.7% (1785/20871), respectively. Sensitivities of the questionnaire for scoliosis, stand flexion, full squatting, torticollis, and flat feet were 16.8% (53/316), 67.9% (250/368), 48.2% (55/114), 18.9% (7/37), and 32.2% (65/202), respectively.Conclusion
We reported the result of musculoskeletal examination. Accuracy and reliability of this questionnaire were not satisfactory. To perform high quality musculoskeletal examinations, we will aim to increase the quality of screening methods. 相似文献5.
6.
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
7.
Christopher N. Cooley Tyler J. Beranek Matthew A. Warpinski Robert Alexander Amanda O. Esquivel 《The American journal of emergency medicine》2019,37(2):199-203
Introduction
In the United States there has been a large increase in participation in lacrosse for both males and females. The purpose of this study was to analyze the number of head injuries, injury rates (calculated using the reported number of participants) and types of head injuries that are seen in emergency departments in the United States.Methods
We compared injuries between male and female lacrosse participants. This was a retrospective study using a publicly available database produced by the US Consumer Product Safety Commission and information about lacrosse participation from US Lacrosse.Results
A linear regression was performed and showed a positive correlation between number of head injuries to males and time from 2002 to 2010 (R2?=?0.823; p?=?0.001). While the number of injuries to the head in female lacrosse participants was not significant. There was a negative correlation between the number of head injuries to males from 2010 to 2016 (R2?=?0.800; p?=?0.007), but again, there was no significance for female injury count (R2?=?0.417; p?=?0.117). Other significant differences between head injuries in males and females included the mechanism of injury and the type of injury recorded.Conclusion
The most recent data from 2010 to 2016, suggest that both males and females have had a decrease in injury rate. However the total number of female head injuries is not significantly decreasing and as the sport continues to grow there will likely be more total head injuries and visits to the emergency department. 相似文献8.
9.
10.