全文获取类型
| 收费全文 | 1834780篇 |
| 免费 | 133572篇 |
| 国内免费 | 2782篇 |
专业分类
| 耳鼻咽喉 | 24128篇 |
| 儿科学 | 60422篇 |
| 妇产科学 | 49402篇 |
| 基础医学 | 276144篇 |
| 口腔科学 | 51622篇 |
| 临床医学 | 169087篇 |
| 内科学 | 354041篇 |
| 皮肤病学 | 40615篇 |
| 神经病学 | 141706篇 |
| 特种医学 | 67868篇 |
| 外国民族医学 | 335篇 |
| 外科学 | 264251篇 |
| 综合类 | 38491篇 |
| 现状与发展 | 4篇 |
| 一般理论 | 692篇 |
| 预防医学 | 146625篇 |
| 眼科学 | 41830篇 |
| 药学 | 136695篇 |
| 10篇 | |
| 中国医学 | 4150篇 |
| 肿瘤学 | 103016篇 |
出版年
| 2018年 | 19683篇 |
| 2017年 | 15106篇 |
| 2016年 | 16589篇 |
| 2015年 | 19028篇 |
| 2014年 | 26153篇 |
| 2013年 | 39881篇 |
| 2012年 | 53657篇 |
| 2011年 | 56978篇 |
| 2010年 | 33213篇 |
| 2009年 | 31789篇 |
| 2008年 | 53651篇 |
| 2007年 | 57458篇 |
| 2006年 | 57452篇 |
| 2005年 | 55443篇 |
| 2004年 | 53547篇 |
| 2003年 | 51171篇 |
| 2002年 | 49594篇 |
| 2001年 | 84556篇 |
| 2000年 | 86174篇 |
| 1999年 | 72166篇 |
| 1998年 | 19870篇 |
| 1997年 | 17612篇 |
| 1996年 | 18171篇 |
| 1995年 | 17266篇 |
| 1994年 | 16045篇 |
| 1993年 | 14940篇 |
| 1992年 | 56697篇 |
| 1991年 | 56088篇 |
| 1990年 | 54346篇 |
| 1989年 | 53120篇 |
| 1988年 | 49010篇 |
| 1987年 | 47838篇 |
| 1986年 | 45619篇 |
| 1985年 | 42955篇 |
| 1984年 | 32469篇 |
| 1983年 | 28029篇 |
| 1982年 | 16217篇 |
| 1981年 | 14651篇 |
| 1979年 | 30409篇 |
| 1978年 | 22026篇 |
| 1977年 | 18476篇 |
| 1976年 | 17400篇 |
| 1975年 | 18885篇 |
| 1974年 | 22617篇 |
| 1973年 | 22193篇 |
| 1972年 | 20886篇 |
| 1971年 | 19584篇 |
| 1970年 | 18620篇 |
| 1969年 | 17414篇 |
| 1968年 | 16158篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
1.
2.
3.
4.
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
5.
6.
7.
Conall T. Morgan Brigitte Mueller Varsha Thakur Vitor Guerra Callaghan Jull Luc Mertens Mark Friedberg Fraser Golding Mike Seed Steven E.S. Miner Edgar T. Jaeggi Cedric Manlhiot Lynne E. Nield 《The Canadian journal of cardiology》2019,35(4):453-461
Background
The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.Methods
A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.Results
Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.Conclusions
In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler. 相似文献8.
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9.
Adilson Cunha Ferreira Edward Araujo Júnior Wellington P. Martins João Francisco Jordão Antônio Hélio Oliani Simon E. Meagher 《The journal of maternal-fetal & neonatal medicine》2015,28(14):1706-1710
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality. 相似文献
10.