全文获取类型
收费全文 | 11858篇 |
免费 | 727篇 |
国内免费 | 51篇 |
专业分类
耳鼻咽喉 | 70篇 |
儿科学 | 224篇 |
妇产科学 | 240篇 |
基础医学 | 1950篇 |
口腔科学 | 278篇 |
临床医学 | 1080篇 |
内科学 | 2409篇 |
皮肤病学 | 247篇 |
神经病学 | 1247篇 |
特种医学 | 592篇 |
外国民族医学 | 1篇 |
外科学 | 1696篇 |
综合类 | 96篇 |
一般理论 | 3篇 |
预防医学 | 556篇 |
眼科学 | 371篇 |
药学 | 774篇 |
中国医学 | 40篇 |
肿瘤学 | 762篇 |
出版年
2023年 | 38篇 |
2022年 | 117篇 |
2021年 | 198篇 |
2020年 | 115篇 |
2019年 | 162篇 |
2018年 | 186篇 |
2017年 | 179篇 |
2016年 | 212篇 |
2015年 | 265篇 |
2014年 | 349篇 |
2013年 | 463篇 |
2012年 | 648篇 |
2011年 | 728篇 |
2010年 | 469篇 |
2009年 | 476篇 |
2008年 | 764篇 |
2007年 | 773篇 |
2006年 | 743篇 |
2005年 | 690篇 |
2004年 | 687篇 |
2003年 | 667篇 |
2002年 | 719篇 |
2001年 | 308篇 |
2000年 | 265篇 |
1999年 | 298篇 |
1998年 | 166篇 |
1997年 | 139篇 |
1996年 | 91篇 |
1995年 | 87篇 |
1994年 | 71篇 |
1993年 | 63篇 |
1992年 | 111篇 |
1991年 | 93篇 |
1990年 | 74篇 |
1989年 | 86篇 |
1988年 | 70篇 |
1987年 | 65篇 |
1986年 | 60篇 |
1985年 | 62篇 |
1984年 | 53篇 |
1983年 | 54篇 |
1982年 | 33篇 |
1981年 | 35篇 |
1980年 | 35篇 |
1979年 | 33篇 |
1978年 | 33篇 |
1977年 | 29篇 |
1975年 | 33篇 |
1974年 | 28篇 |
1933年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
best practice onkologie - 相似文献
3.
4.
Health care expenditure in Germany shows clear regional differences. Such geographic variations are often seen as an indicator for inefficiency. With its homogeneous health care system, low co‐payments and uniform prices, Germany is a particularly suited example to analyse regional variations. We use data for the year 2011 on expenditure, utilization of health services and state of health in Germany's statutory health insurance system. This data, which originate from a variety of administrative sources and cover about 90% of the population, are enriched with a wealth of socio‐economic variables, data on pollutants, prices and individual preferences. State of health and demography explains 55% of the differences as measured by the standard deviation while all control variables account for a total of 72% of the differences at county level. With other measures of variation, we can account for an even greater proportion. A higher proportion of variation than usually supposed can thus be explained. Whilst this study cannot quantify inefficiencies, our results contradict the thesis that regional variations reflect inefficiency. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
5.
6.
Schmitz Jan Jansen Stefanie Meyer Moritz Hinkelbein Jochen 《Notfall & Rettungsmedizin》2022,25(4):285-293
Notfall + Rettungsmedizin - Tauchunfälle sind vergleichsweise selten und stellen (Erst‑)Helfer vor besondere Herausforderungen. Sie müssen schnell und kompetent behandelt werden, da... 相似文献
7.
Uwe Schneider PhD Antony Lomax Peter Pemler Jürgen Besserer Dieter Ross Norbert Lombriser Barbara Kaser-Hotz 《Strahlentherapie und Onkologie》2006,182(11):647-652
BACKGROUND AND PURPOSE: There is concern about the increase of radiation-induced malignancies with the application of modern radiation treatment techniques such as intensity-modulated radiotherapy (IMRT) and proton radiotherapy. Therefore, X-ray scatter and neutron radiation as well as the impact of the primary dose distribution on secondary cancer incidence are analyzed. MATERIAL AND METHODS: The organ equivalent dose (OED) concept with a linear-exponential and a plateau dose-response curve was applied to dose distributions of 30 patients who received radiation therapy of prostate cancer. Three-dimensional conformal radiotherapy was used in eleven patients, another eleven patients received IMRT with 6-MV photons, and eight patients were treated with spot-scanned protons. The treatment plans were recalculated with 15-MV and 18-MV photons. Secondary cancer risk was estimated based on the OED for the different treatment techniques. RESULTS: A modest increase of 15% radiation-induced cancer results from IMRT using low energies (6 MV), compared to conventional four-field planning with 15-MV photons (plateau dose-response: 1%). The probability to develop a secondary cancer increases with IMRT of higher energies by 20% and 60% for 15 MV and 18 MV, respectively (plateau dose-response: 2% and 30%). The use of spot-scanned protons can reduce secondary cancer incidence as much as 50% (independent of dose-response). CONCLUSION: By including the primary dose distribution into the analysis of radiation-induced cancer incidence, the resulting increase in risk for secondary cancer using modern treatment techniques such as IMRT is not as dramatic as expected from earlier studies. By using 6-MV photons, only a moderate risk increase is expected. Spot-scanned protons are the treatment of choice in regard to secondary cancer incidence. 相似文献
8.
R. Watson T. Kozlowski V. Nickeleit J. T. Woosley J. L. Schmitz S. L. Zacks J. H. Fair D. A. Gerber K. A. Andreoni 《American journal of transplantation》2006,6(12):3022-3029
Antibody-mediated rejection (AMR) after liver transplantation is recognized in ABO incompatible and xeno-transplantation, but its role after ABO compatible liver transplantation is controversial. We report a case of ABO compatible liver transplantation that demonstrated clinical, serological and histological signs of AMR without evidence of concurrent acute cellular rejection. AMR with persistently high titers of circulating donor specific antibodies resulted in graft injury with initial centrilobular hepatocyte necrosis, fibroedematous portal expansion mimicking biliary tract outflow obstruction, ultimately resulting in extensive bridging fibrosis. Immunofluorescence microscopy demonstrated persistent, diffuse linear C4d deposits along sinusoids and central veins. Despite intense therapeutic intervention including plasmapheresis, IVIG and rituximab, AMR led to graft failure. We present evidence that an antibody-mediated alloresponse to an ABO compatible liver graft can cause significant graft injury independent of acute cellular rejection. AMR shows distinct histologic changes including a characteristic staining profile for C4d. 相似文献
9.
V. Schmitz U. P. Neumann G. Puhl Z. V. Tran P. Neuhaus J. M. Langrehr 《American journal of transplantation》2006,6(2):379-385
Choledochojejunostomy (CJS) is commonly used for biliary reconstruction in liver transplantation for primary sclerosing cholangitis (PSC). We alternatively performed choledochoduodenostomy (CDS) and side-to-side choledochodocholedochstomy in a large cohort of patients. Fifty-one patients with PSC, transplanted between 1988 and 2000, were analyzed retrospectively. Biliary reconstruction was CDS in 25 (49%), CJS in 20 (39%) and CC in 6 transplantations (12%). Biliary leaks occurred in the early follow-up (< or =41 days) only in CDS patients (20%). However, in the late follow-up (>4 months), stricturing of anastomosis was found once in CDS (4%) and CJS (5%). Later (>9 months), intrahepatic bile duct strictures were diagnosed in four CDS (16%), one CJS (5%) and one CC (17%) patient(s). In 48% of CDS (12/25), 60% of CJS (12/20) and 17% of CC (1/6) at least one incidence of cholangitis was observed. Overall, biliary complication rates were significantly higher in CDS (40%) than CJS (10%) and CC (17%); of those none in CC and 12% in CDS were anastomosis-related. Graft/patient survival showed no significant differences among groups. Based on our results we consider CJS the standard method for biliary reconstruction in PSC; however, in selected cases where CJS is difficult to accomplish because of previous surgery or for retransplantation, CDS may present an alternative technique. 相似文献
10.