全文获取类型
收费全文 | 8763篇 |
免费 | 841篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 213篇 |
儿科学 | 218篇 |
妇产科学 | 381篇 |
基础医学 | 876篇 |
口腔科学 | 174篇 |
临床医学 | 809篇 |
内科学 | 1880篇 |
皮肤病学 | 219篇 |
神经病学 | 750篇 |
特种医学 | 523篇 |
外国民族医学 | 2篇 |
外科学 | 1439篇 |
综合类 | 131篇 |
一般理论 | 3篇 |
预防医学 | 684篇 |
眼科学 | 264篇 |
药学 | 351篇 |
中国医学 | 5篇 |
肿瘤学 | 701篇 |
出版年
2021年 | 74篇 |
2019年 | 100篇 |
2018年 | 111篇 |
2017年 | 94篇 |
2016年 | 117篇 |
2015年 | 125篇 |
2014年 | 174篇 |
2013年 | 241篇 |
2012年 | 325篇 |
2011年 | 349篇 |
2010年 | 209篇 |
2009年 | 172篇 |
2008年 | 301篇 |
2007年 | 343篇 |
2006年 | 373篇 |
2005年 | 342篇 |
2004年 | 316篇 |
2003年 | 337篇 |
2002年 | 291篇 |
2001年 | 266篇 |
2000年 | 319篇 |
1999年 | 279篇 |
1998年 | 121篇 |
1997年 | 108篇 |
1996年 | 90篇 |
1995年 | 86篇 |
1994年 | 88篇 |
1993年 | 77篇 |
1992年 | 217篇 |
1991年 | 227篇 |
1990年 | 230篇 |
1989年 | 206篇 |
1988年 | 190篇 |
1987年 | 181篇 |
1986年 | 202篇 |
1985年 | 200篇 |
1984年 | 135篇 |
1983年 | 131篇 |
1982年 | 92篇 |
1981年 | 89篇 |
1980年 | 76篇 |
1979年 | 155篇 |
1978年 | 106篇 |
1977年 | 112篇 |
1976年 | 93篇 |
1975年 | 103篇 |
1974年 | 129篇 |
1973年 | 109篇 |
1972年 | 97篇 |
1971年 | 74篇 |
排序方式: 共有9623条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
C. M. Gordon E. Binello M. S. LeBoff M. E. Wohl C. J. Rosen A. A. Colin 《Osteoporosis international》2006,17(5):783-790
Introduction Patients with cystic fibrosis (CF) are known to be at risk for early osteoporosis, and the mechanisms that mediate bone loss
are still being delineated. The aim of the present investigation was to investigate if a correlation exists in these patients
between skeletal measurements by dual-energy x-ray absorptiometry (DXA) and two anabolic factors, dehydroepiandrosterone (DHEA)
and insulin-like growth factor I (IGF-I), and proresorptive factors such as the cytokines interleukin-1β, tumor necrosis factor α,
and interleukin-6.
Methods We studied 32 outpatients (18 females; mean age: 26.2 ± 7.9 years) at a tertiary care medical center. The subjects had venous
samples obtained, underwent anthropometric and bone mineral density (BMD) measurements, and completed a health survey. Serum
IGF-I concentrations were below the age-adjusted mean in 78% of the participants, and DHEA sulfate (DHEAS) concentrations
were low in 72%. Serum concentrations of all cytokines were on the low side of normal; nonetheless, there was a modest inverse
correlation between IL-1β and BMD at all sites.
Results In univariate analyses, IGF-I and DHEAS were significant correlates of BMD or bone mineral content. In final multivariate
models controlling for anthropometric and other variables of relevance to bone density, only IGF-I was identified as a significant
independent skeletal predictor. While alterations in DHEAS, IGF-I, and specific cytokines may contribute to skeletal deficits
in patients with CF, of these factors a low IGF-I concentration appears to be most strongly correlated with BMD.
Conclusions These findings may have therapeutic implications for enhancing bone density in these patients. 相似文献
5.
Scott A Fields Elizabeth Morrison Ernie Yoder Kevin Krane Thomas Agresta Rich Esham Frederick McCurdy Jonathan Rosen James Shumway 《Academic medicine》2002,77(6):543-546
PURPOSE: Chart notes are used to support billing codes under the evaluation and management guidelines of the Health Care Financing Administration (HCFA), in addition to serving as a record of the visit. To better understand the effect of the HCFA documentation guidelines, the authors collected data on how the guidelines affect participation by university- and community-based faculty in clinical education programs. METHOD: In 2000, the authors sent six copies of their questionnaire to the associate deans of the 125 U.S. medical schools and requested they distribute them to all core clerkship directors. The questionnaire consisted of multiple-choice and short-answer questions regarding documentation of medical visits, participation of community-based faculty, understanding of HCFA documentation guidelines, and effects on education programs. RESULTS: The response rate was about 50%. Most of the 379 clerkship directors who responded (77%) stated they were aware the HCFA documentation guidelines include specifications regarding the role medical students can play and documentation of medical visits, and 64% indicated they were concerned the guidelines would affect their educational programs. Concerns included the loss of student independence and active participation in the patient care environment (37), time constraints and the changing balance between education and service (16), loss of faculty and decreased morale (11), and decreased quality of care for patients (7). CONCLUSION: Leaders of medical education must work to modify these guidelines to protect the quality of patients' care, while maximizing students' educational opportunity and participation. 相似文献
6.
7.
8.
Steven D. Wexner MD FACS FRCS FRCS Lester Rosen MD Todd H. Baron MD FASGE 《Gastrointestinal endoscopy》2007,65(7):1104-1105
9.
Stuart D Rosen 《European heart journal》2004,25(19):1672-1674
10.
A provisional set of standards of care was derived from a quality assurance strand of a wider research project, which reported the development of evaluation strategies for area integrated mental health services (AIMHS). In contrast to most published standards, they apply to all facets of care in a comprehensive catchment area mental health service, whether clinical or functional, community or hospital based, urban or rural, or managed by the public, private or voluntary sectors. We review briefly existing sets of standards of mental health services and report the process of development of standards of care, each with sub-sets of performance indicators and examples. While the AIMHS standards and a companion quality assurance manual are still undergoing refinement, they offer a guide for mental health professionals to the provision of services, and a checklist to service-users of services that should be available to them at every stage of care in a mental health system. 相似文献