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   13951篇
  免费   1073篇
  国内免费   38篇
耳鼻咽喉   77篇
儿科学   361篇
妇产科学   175篇
基础医学   1839篇
口腔科学   274篇
临床医学   1473篇
内科学   2723篇
皮肤病学   185篇
神经病学   1377篇
特种医学   574篇
外科学   1897篇
综合类   137篇
一般理论   32篇
预防医学   1686篇
眼科学   241篇
药学   977篇
中国医学   20篇
肿瘤学   1014篇
  2024年   11篇
  2023年   137篇
  2022年   213篇
  2021年   475篇
  2020年   289篇
  2019年   397篇
  2018年   453篇
  2017年   353篇
  2016年   378篇
  2015年   444篇
  2014年   549篇
  2013年   754篇
  2012年   1159篇
  2011年   1136篇
  2010年   701篇
  2009年   579篇
  2008年   993篇
  2007年   945篇
  2006年   897篇
  2005年   878篇
  2004年   812篇
  2003年   743篇
  2002年   610篇
  2001年   118篇
  2000年   76篇
  1999年   83篇
  1998年   119篇
  1997年   91篇
  1996年   79篇
  1995年   58篇
  1994年   59篇
  1993年   48篇
  1992年   41篇
  1991年   28篇
  1990年   25篇
  1989年   22篇
  1988年   19篇
  1987年   17篇
  1986年   17篇
  1985年   16篇
  1984年   23篇
  1983年   14篇
  1982年   20篇
  1981年   16篇
  1980年   12篇
  1979年   14篇
  1978年   14篇
  1914年   12篇
  1913年   10篇
  1912年   10篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
ObjectivesPatients with atrial fibrillation (AF) have rapid and irregular heart rates, increasing the risk of comorbidities and mortality. Next to formal medical care, many patients receive informal care from their social environment. The objective of this study was to examine the well-being and economic burden of providing informal care to patients with AF in the UK, Italy, and Germany.MethodsCaregivers of patients with AF completed an online survey based on the iMTA Valuation of Informal Care Questionnaire, with questions about their caregiving situation, perceived burden of caregiving, and absence from work due to health problems resulting from caregiving. Care-related quality-of-life utilities were calculated using the Care-related Quality of Life instrument and associated tariffs. Societal costs of caregiving were calculated based on the proxy good method.ResultsA total of 585 caregivers participated in this study. On average, caregivers provided 33 hours of informal care per week to patients (SD 29 hours). On a scale from 0 to 10, their self-rated burden was 5.4. The average Care-related Quality of Life utility was 72. Caregivers primarily indicated problems with daily activities, mental health, and physical health. Still, the vast majority of caregivers (87%) derived fulfillment from providing care. Weekly societal costs of caregiving were on average €636. Comorbidities contributed substantially to the caregiver time and burden.ConclusionsCaring for a patient with AF is associated with substantial objective and subjective burden, but also provides fulfillment from being able to care for a loved one.  相似文献   
102.
103.
Lasers in Medical Science - Ultraviolet radiation (UVR) is the major etiologic agent of cutaneous photoaging, and different strategies are used to prevent and treat this condition. The...  相似文献   
104.
Lasers in Medical Science - Acne vulgaris is the most recurring skin condition in the world, causing great harm to the physical and psychological well-being of many patients. Antimicrobial...  相似文献   
105.
Reduced bone mineral density (BMD; ie, Z-score ≤−2.0) occurring at a young age (ie, premenopausal women and men <50 years) in the absence of secondary osteoporosis is considered early-onset osteoporosis (EOOP). Mutations affecting the WNT signaling pathway are of special interest because of their key role in bone mass regulation. Here, we analyzed the effects of relevant LRP5 and LRP6 variants on the clinical phenotype, bone turnover, BMD, and bone microarchitecture. After exclusion of secondary osteoporosis, EOOP patients (n = 372) were genotyped by gene panel sequencing, and segregation analysis of variants in LRP5/LRP6 was performed. The clinical assessment included the evaluation of bone turnover parameters, BMD by dual-energy X-ray absorptiometry, and microarchitecture via high-resolution peripheral quantitative computed tomography (HR-pQCT). In 50 individuals (31 EOOP index patients, 19 family members), relevant variants affecting LRP5 or LRP6 were detected (42 LRP5 and 8 LRP6 variants), including 10 novel variants. Seventeen variants were classified as disease causing, 14 were variants of unknown significance, and 19 were BMD-associated single-nucleotide polymorphisms (SNPs). One patient harbored compound heterozygous LRP5 mutations causing osteoporosis-pseudoglioma syndrome. Fractures were reported in 37 of 50 individuals, consisting of vertebral (18 of 50) and peripheral (29 of 50) fractures. Low bone formation was revealed in all individuals. A Z-score ≤−2.0 was detected in 31 of 50 individuals, and values at the spine were significantly lower than those at the hip (−2.1 ± 1.3 versus −1.6 ± 0.8; p = .003). HR-pQCT analysis (n = 34) showed impaired microarchitecture in trabecular and cortical compartments. Significant differences regarding the clinical phenotype were detectable between index patients and family members but not between different variant classes. Relevant variants in LRP5 and LRP6 contribute to EOOP in a substantial number of individuals, leading to a high number of fractures, low bone formation, reduced Z-scores, and impaired microarchitecture. This detailed skeletal characterization improves the interpretation of known and novel LRP5 and LRP6 variants. © 2020 The Authors. Journal of Bone and Mineral Research published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research (ASBMR).  相似文献   
106.
PurposeEnormous variability in management and cost occurs in CDH care. The purpose of this study was to identify regional mortality and cost patterns underlying this variability.MethodsThis is a retrospective study of neonatal CDH patients at U.S. hospitals using data from the Pediatric Health Information System (PHIS) database (2015–2018). Patients were risk-stratified using CDH Study Group predicted survival (CDHSG-PS), and mortality and costs were assessed by region (East, West, Mid-West, and South) and center.ResultsHigher mortality and extracorporeal life support (ECLS) rates were found in the Mid-West and South (p < 0.0001). Higher mortality was seen with ECLS among low-volume centers in the South (p = 0.007). When broken down by CHDSG-PS, higher severity patients had higher mortality in the Mid-West and South (p = 0.038). Cost was significantly lower for high severity nonsurvivors than survivors ($244,005 vs $565,487, p = 0.0008). The East spent more on high-severity patients with lower mortality compared to other regions, but also spent 3.5 times more on low severity nonsurvivors than survivors. Costs were higher at high-volume centers for low- and medium-severity patients, but all centers spent the same on high-severity patients.ConclusionCenter volume, region, and patient severity all contribute to the complex survival and cost disparities that exist in CDH care. Standardization of care may improve survival and reduce cost variability.Type of studyRetrospective database study.Level of evidenceLevel II  相似文献   
107.
108.
109.
PurposeThe purpose of this study was for an international panel of experts to establish consensus indications for distal rectus femoris surgery in children with cerebral palsy (CP) using a modified Delphi method.MethodsThe panel used a five-level Likert scale to record agreement or disagreement with 33 statements regarding distal rectus femoris surgery. The panel responded to statements regarding general characteristics, clinical indications, computerized gait data, intraoperative techniques and outcome measures. Consensus was defined as at least 80% of responses being in the highest or lowest two of the five Likert ratings, and general agreement as 60% to 79% falling into the highest or lowest two ratings. There was no agreement if neither threshold was reached.ResultsConsensus or general agreement was reached for 17 of 33 statements (52%). There was general consensus that distal rectus femoris surgery is better for stiff knee gait than is proximal rectus femoris release. There was no consensus about whether the results of distal rectus femoris release were comparable to those following distal rectus femoris transfer. Gross Motor Function Classification System (GMFCS) level was an important factor for the panel, with the best outcomes expected in children functioning at GMFCS levels I and II. The panel also reached consensus that they do distal rectus femoris surgery less frequently than earlier in their careers, in large part reflecting the narrowing of indications for this surgery over the last decade.ConclusionThis study can help paediatric orthopaedic surgeons optimize decision-making for, and outcomes of, distal rectus femoris surgery in children with CP.Level of evidenceV  相似文献   
110.
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