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   7599篇
  免费   453篇
  国内免费   53篇
耳鼻咽喉   74篇
儿科学   272篇
妇产科学   180篇
基础医学   1277篇
口腔科学   108篇
临床医学   590篇
内科学   1849篇
皮肤病学   178篇
神经病学   793篇
特种医学   146篇
外科学   628篇
综合类   23篇
预防医学   660篇
眼科学   156篇
药学   585篇
中国医学   37篇
肿瘤学   549篇
  2024年   6篇
  2023年   49篇
  2022年   134篇
  2021年   280篇
  2020年   162篇
  2019年   223篇
  2018年   239篇
  2017年   200篇
  2016年   205篇
  2015年   245篇
  2014年   326篇
  2013年   398篇
  2012年   629篇
  2011年   632篇
  2010年   323篇
  2009年   268篇
  2008年   479篇
  2007年   537篇
  2006年   502篇
  2005年   464篇
  2004年   432篇
  2003年   387篇
  2002年   364篇
  2001年   41篇
  2000年   29篇
  1999年   47篇
  1998年   69篇
  1997年   61篇
  1996年   47篇
  1995年   47篇
  1994年   34篇
  1993年   34篇
  1992年   31篇
  1991年   19篇
  1990年   16篇
  1989年   13篇
  1988年   20篇
  1987年   15篇
  1986年   14篇
  1985年   7篇
  1984年   9篇
  1983年   10篇
  1982年   8篇
  1981年   10篇
  1980年   5篇
  1978年   8篇
  1977年   3篇
  1976年   5篇
  1975年   3篇
  1974年   4篇
排序方式: 共有8105条查询结果,搜索用时 265 毫秒
91.
92.
To explore attitudes of physicians attending births in the public and private sectors and at the managerial level toward cesarean birth in Nicaragua. A qualitative study was conducted consisting of four focus groups with 17 physicians and nine in-depth interviews with decision-makers. Although study participants listed many advantages of vaginal birth and disadvantages of cesarean birth, they perceived that the increase in the cesarean birth rate in Nicaragua has resulted in a reduction in perinatal morbidity and mortality. They ascribed high cesarean birth rates to a web of interrelated provider, patient, and health system factors. They identified five actions that would facilitate a reduction in the number of unnecessary cesarean operations: establishing standards and protocols; preparing women and their families for labor and childbirth; incorporating cesarean birth rate monitoring and audit systems into quality assurance activities at the facility level; strengthening the movement to humanize birth; and promoting community-based interventions to educate women and families about the benefits of vaginal birth. Study participants believe that by performing cesarean operations they are providing the best quality of care feasible within their context. They do not perceive problems with their current practice. The identified causes of unnecessary cesarean operations in Nicaragua are multifactorial, so it appears that a multi-layered strategy is needed to safely reduce cesarean birth rates. The recent Nicaraguan Ministry of Health guidance to promote parto humanizado (“humanization of childbirth”) could serve as the basis for a collaborative effort among health care professionals, government, and consumer advocates to reduce the number of unnecessary cesarean births in Nicaragua.  相似文献   
93.
Clinical Rheumatology - Rheumatoid vasculitis (RV) is one of the most severe extra-articular manifestations of rheumatoid arthritis, with significant morbidity and mortality, requiring aggressive...  相似文献   
94.
Patients with severe mental illness have higher prevalences of cardiovascular risk factors (CRF). The objective is to determine whether interventions to modify lifestyles in these patients reduce anthropometric and analytical parameters related to CRF in comparison to routine clinical practice. Systematic review of controlled clinical trials with lifestyle intervention in Medline, Cochrane Library, Embase, PsycINFO and CINALH. Change in body mass index, waist circumference, cholesterol, triglycerides and blood sugar. Meta-analyses were performed using random effects models to estimate the weighted mean difference. Heterogeneity was determined using i2 statistical and subgroups analyses. 26 studies were selected. Lifestyle interventions decrease anthropometric and analytical parameters at 3 months follow up. At 6 and 12 months, the differences between the intervention and control groups were maintained, although with less precision. More studies with larger samples and long-term follow-up are needed.  相似文献   
95.
96.
Aim of the current study was to evaluate the inter‐observer agreement between pathologists in the diagnosis of celiac disease (CD), in the qualified context of a multicenter study. Biopsies from the “PreventCD” study, a multinational‐ prospective‐ randomized study in children with at least one‐first‐degree relative with CD and positive for HLA‐DQ2/HLA‐DQ8. Ninety‐eight biopsies were evaluated. Considering diagnostic samples with villous atrophy (VA), the agreement was satisfactory (κ = 0.84), but much less when assessing the severity of these lesions. The use of the recently proposed Corazza‐Villanacci classification showed a moderately higher level of agreement (κ = 0.39) than using the Marsh‐Oberhuber system (κ = 0.31). 57.1% of cases were considered correctly oriented. A number of >4 samples per patient was statistically associated to a better agreement; orientation did not impact on κ values. Agreement results in this study appear more satisfactory than in previous papers and this is justified by the involvement of centers with experience in CD diagnosis and by the well‐controlled setting. Despite this, the reproducibility was far from optimal with a poor agreement in grading the severity of VA. Our results stress the need of a minimum of four samples to be assessed by the pathologist.  相似文献   
97.
98.
99.
Setor K. Kunutsor  Michael R. Whitehouse  Ashley W. Blom  Tim Board  Peter Kay  B. Mike Wroblewski  Valérie Zeller  Szu-Yuan Chen  Pang-Hsin Hsieh  Bassam A. Masri  Amir Herman  Jean-Yves Jenny  Ran Schwarzkopf  John-Paul Whittaker  Ben Burston  Ronald Huang  Camilo Restrepo  Javad Parvizi  Sergio Rudelli  Emerson Honda  David E. Uip  Guillem Bori  Ernesto Muñoz-Mahamud  Elizabeth Darley  Alba Ribera  Elena Cañas  Javier Cabo  José Cordero-Ampuero  Maria Luisa Sorlí Redó  Simon Strange  Erik Lenguerrand  Rachael Gooberman-Hill  Jason Webb  Alasdair MacGowan  Paul Dieppe  Matthew Wilson  Andrew D. Beswick  The Global Infection Orthopaedic Management Collaboration 《European journal of epidemiology》2018,33(10):933-946
One-stage and two-stage revision strategies are the two main options for treating established chronic peri-prosthetic joint infection (PJI) of the hip; however, there is uncertainty regarding which is the best treatment option. We aimed to compare the risk of re-infection between the two revision strategies using pooled individual participant data (IPD). Observational cohort studies with PJI of the hip treated exclusively by one- or two-stage revision and reporting re-infection outcomes were retrieved by searching MEDLINE, EMBASE, Web of Science, The Cochrane Library, and the WHO International Clinical Trials Registry Platform; as well as email contact with investigators. We analysed IPD of 1856 participants with PJI of the hip from 44 cohorts across four continents. The primary outcome was re-infection (recurrence of infection by the same organism(s) and/or re-infection with a new organism(s)). Hazard ratios (HRs) for re-infection were calculated using Cox proportional frailty hazards models. After a median follow-up of 3.7 years, 222 re-infections were recorded. Re-infection rates per 1000 person-years of follow-up were 16.8 (95% CI 13.6–20.7) and 32.3 (95% CI 27.3–38.3) for one-stage and two-stage strategies respectively. The age- and sex-adjusted HR of re-infection for two-stage revision was 1.70 (0.58–5.00) when compared with one-stage revision. The association remained consistently absent after further adjustment for potential confounders. The HRs did not vary importantly in clinically relevant subgroups. Analysis of pooled individual patient data suggest that a one-stage revision strategy may be as effective as a two-stage revision strategy in treating PJI of the hip.  相似文献   
100.
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