首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4739439篇
  免费   372127篇
  国内免费   15527篇
耳鼻咽喉   66703篇
儿科学   152328篇
妇产科学   126484篇
基础医学   714535篇
口腔科学   130537篇
临床医学   431389篇
内科学   866275篇
皮肤病学   114598篇
神经病学   397160篇
特种医学   185609篇
外国民族医学   1036篇
外科学   716707篇
综合类   131926篇
现状与发展   24篇
一般理论   2740篇
预防医学   391632篇
眼科学   111079篇
药学   336388篇
  26篇
中国医学   12772篇
肿瘤学   237145篇
  2021年   56522篇
  2019年   59120篇
  2018年   75335篇
  2017年   57841篇
  2016年   64123篇
  2015年   76753篇
  2014年   111008篇
  2013年   176671篇
  2012年   134639篇
  2011年   141616篇
  2010年   129164篇
  2009年   129840篇
  2008年   127856篇
  2007年   136598篇
  2006年   144717篇
  2005年   139007篇
  2004年   139757篇
  2003年   129985篇
  2002年   119142篇
  2001年   184614篇
  2000年   180453篇
  1999年   163972篇
  1998年   73789篇
  1997年   69145篇
  1996年   67125篇
  1995年   62497篇
  1994年   56430篇
  1993年   52351篇
  1992年   119582篇
  1991年   114062篇
  1990年   109959篇
  1989年   107101篇
  1988年   98727篇
  1987年   96764篇
  1986年   91525篇
  1985年   88965篇
  1984年   72992篇
  1983年   64540篇
  1982年   49881篇
  1981年   46102篇
  1980年   43243篇
  1979年   63139篇
  1978年   49972篇
  1977年   44198篇
  1976年   41047篇
  1975年   41645篇
  1974年   46023篇
  1973年   44112篇
  1972年   41375篇
  1971年   38164篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.

Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.

Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings.  相似文献   

92.
93.
94.
95.
96.
97.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
98.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  相似文献   
99.
100.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号