全文获取类型
收费全文 | 403281篇 |
免费 | 26111篇 |
国内免费 | 2924篇 |
专业分类
耳鼻咽喉 | 5396篇 |
儿科学 | 8621篇 |
妇产科学 | 10392篇 |
基础医学 | 56545篇 |
口腔科学 | 12486篇 |
临床医学 | 31776篇 |
内科学 | 84528篇 |
皮肤病学 | 9152篇 |
神经病学 | 29054篇 |
特种医学 | 14832篇 |
外国民族医学 | 82篇 |
外科学 | 64686篇 |
综合类 | 10041篇 |
现状与发展 | 1篇 |
一般理论 | 65篇 |
预防医学 | 18245篇 |
眼科学 | 9920篇 |
药学 | 32639篇 |
1篇 | |
中国医学 | 2245篇 |
肿瘤学 | 31609篇 |
出版年
2021年 | 3158篇 |
2019年 | 3096篇 |
2018年 | 5016篇 |
2017年 | 3826篇 |
2016年 | 3999篇 |
2015年 | 4487篇 |
2014年 | 6332篇 |
2013年 | 8163篇 |
2012年 | 11259篇 |
2011年 | 11643篇 |
2010年 | 6935篇 |
2009年 | 6540篇 |
2008年 | 10672篇 |
2007年 | 11638篇 |
2006年 | 11582篇 |
2005年 | 10649篇 |
2004年 | 10057篇 |
2003年 | 9866篇 |
2002年 | 9587篇 |
2001年 | 29005篇 |
2000年 | 29498篇 |
1999年 | 24319篇 |
1998年 | 5519篇 |
1997年 | 4524篇 |
1996年 | 4053篇 |
1995年 | 3689篇 |
1994年 | 3287篇 |
1993年 | 3023篇 |
1992年 | 16540篇 |
1991年 | 15238篇 |
1990年 | 14533篇 |
1989年 | 14349篇 |
1988年 | 12937篇 |
1987年 | 12449篇 |
1986年 | 11423篇 |
1985年 | 10634篇 |
1984年 | 7131篇 |
1983年 | 5785篇 |
1982年 | 2823篇 |
1979年 | 5619篇 |
1978年 | 3461篇 |
1977年 | 3056篇 |
1975年 | 2741篇 |
1974年 | 3159篇 |
1973年 | 2963篇 |
1972年 | 2930篇 |
1971年 | 2860篇 |
1970年 | 2603篇 |
1969年 | 2645篇 |
1968年 | 2347篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
81.
82.
83.
Retreatment in patients with psoriasis achieving response with etanercept after relapse due to treatment interruption: results from the CRYSTEL study 下载免费PDF全文
84.
85.
86.
A. Zampieron M. Elseviers P. Ormandy H. Vlaminck J.‐Y. De Vos T. Kafkia E. Lindley M. Harrington 《Journal of Renal Care》2006,32(1):14-19
This paper describes a study to capture the key roles and activities of nephrology nurses across different countries in Europe. The concept of the study and the need to clarify the activities of the nephrology nurse arose as part of a larger study to develop the European Practice Database (EPD) (1). The Research Board (EDTNA/ERCA) needed to identify key questions that would detect significant differences in the role and responsibilities of nephrology nurses in different countries and monitor the evolution over time of nephrology nursing practice in Europe. It was therefore appropriate to devise a separate small study to generate evidence based questions for the EPD and confirm the reliability and usefulness of the information captured. 相似文献
87.
Lalia Y. Ibrahim Krank P. DiFilippo Geremy E. Steed Manuel D. Cerqueira 《Journal of nuclear cardiology》2006,13(6):855-866
Conclusion Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve
high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed
to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially
if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable
problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the
available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality
control to obtain the best possible images. 相似文献
88.
Takao Itoi Atsushi Sofuni Fumihide Itokawa Yasushi Shinohara Kazuya Takeda Kazuto Nakamura Toshio Kurihara Takayoshi Tsuchiya Fuminori Moriyasu 《Digestive endoscopy》2006,18(3):232-238
We describe our methods and outcomes of multidisciplinary treatments in patients with unresectable hilar cholangiocarcinoma. Fifty‐seven patients with a known outcome were enrolled. Thirty‐four of 57 patients were treated and evaluated by salvage therapy. For salvage therapy, we used internal and external radiotherapy, photodynamic therapy, YAG laser therapy and microwave coagulation therapy. The median survival time was 548 days for the group receiving salvage therapy and 198 days for the group not receiving this treatment. In conclusion, although no randomization of the patients was performed in this retrospective study, our present data provide convincing evidence that salvage therapy is a useful therapeutic approach for unresectable hilar cholangiocarcinomas. 相似文献
89.
Eijiro Morita Torao Tanaka Tetsuya Nakamura Fumitaka Terabe Ichiro Hirata Kenichi Katsu Masakazu Takazoe Akira Terano 《Digestive endoscopy》2006,18(4):263-268
Background and Aims: Video capsule endoscopy (VCE) has become increasingly important as a simple method for observing the entire small intestine. The indications for VCE are obscure gastrointestinal bleeding and investigation of Crohn’s disease (CD). However, the correlation between endoscopic findings obtained by VCE and clinical findings in known cases of CD is not clear, and we therefore investigated this in the present study. Patients and methods: In 30 patients with known CD (Crohn’s disease activity index [CDAI] 0–420; median = 158.3), double contrast enteroclysis (ENT) was performed 1–3 weeks prior to VCE. The relationship between the VCE findings and hematological analysis/CDAI was examined. Results: In 17 of 30 patients, the entire small intestine could be investigated by VCE, whereas in the remaining 13 patients the terminal ileum could not be investigated. The following exhibited positive correlations: total lesions and CDAI (correlation coefficient values: rs = 0.661, adjusted P < 0.0061), ulcers and C‐reactive protein (CRP) (rs = 0.607, adjusted P < 0.0061), total lesions and CRP (rs = 0.604, adjusted P < 0.0061). Conclusions: Analysis with VCE suggests that CDAI and CRP indicate the activity of intestinal lesions in patients with known CD, and that CRP, in particular, is associated with the activity of ulcerative lesions of the intestine. This may contribute to revised guidelines for VCE in the future. 相似文献
90.
S. Nishida J. J. Gaynor N. Nakamura F. Butt H. G. Illanes J. Kadono G. W. Neff D. M. Levi J. I. Moon G. Selvaggi T. Kato P. Ruiz A. G. Tzakis J. R. Madariaga 《American journal of transplantation》2006,6(1):140-149
A retrospective study of 1058 liver transplant recipients was performed to determine: (i) the incidence, etiology, timing, clinical features and treatment of refractory ascites (RA), (ii) risk factors for RA development, (iii) predictors of RA disappearance, (iv) predictors of survival following RA and (v) the impact of RA on patient survival. Sixty-two patients (5.9%) developed RA and its disappearance occurred in 27/62 cases. Patients having hepatitis C virus (HCV) had a significantly higher hazard rate of developing RA (p < 0.00001). No other baseline characteristic was associated with RA. Cox stepwise regression analysis of the hazard rate of RA disappearance found two significant factors: HCV recurrence as the reason for developing RA implied a poorer outcome (p = 0.006), whereas an unknown reason implied a favorable outcome (p = 0.02). In addition, survival following RA was significantly poorer among patients having bacterial peritonitis or HCV recurrence. Finally, the mortality rate was significantly (nearly 8.6 times) higher in patients following RA development while it was ongoing (p < 0.00001); however, if the RA disappeared, then the additional risk of death also disappeared. This study illustrates the importance of developing an optimal treatment strategy to (i) effectively treat RA if it develops and (ii) prevent hepatitis C recurrence. 相似文献