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   35303篇
  免费   2494篇
  国内免费   135篇
耳鼻咽喉   426篇
儿科学   925篇
妇产科学   600篇
基础医学   4270篇
口腔科学   665篇
临床医学   3359篇
内科学   8420篇
皮肤病学   562篇
神经病学   3181篇
特种医学   1175篇
外国民族医学   1篇
外科学   5024篇
综合类   444篇
一般理论   17篇
预防医学   2852篇
眼科学   783篇
药学   2628篇
  1篇
中国医学   62篇
肿瘤学   2537篇
  2023年   152篇
  2022年   111篇
  2021年   555篇
  2020年   385篇
  2019年   621篇
  2018年   741篇
  2017年   557篇
  2016年   602篇
  2015年   653篇
  2014年   1039篇
  2013年   1524篇
  2012年   2314篇
  2011年   2380篇
  2010年   1332篇
  2009年   1208篇
  2008年   2285篇
  2007年   2515篇
  2006年   2573篇
  2005年   2495篇
  2004年   2434篇
  2003年   2341篇
  2002年   2273篇
  2001年   248篇
  2000年   182篇
  1999年   296篇
  1998年   411篇
  1997年   304篇
  1996年   293篇
  1995年   338篇
  1994年   307篇
  1993年   272篇
  1992年   210篇
  1991年   167篇
  1990年   162篇
  1989年   150篇
  1988年   149篇
  1987年   169篇
  1986年   137篇
  1985年   166篇
  1984年   264篇
  1983年   231篇
  1982年   328篇
  1981年   277篇
  1980年   245篇
  1979年   107篇
  1978年   154篇
  1977年   143篇
  1976年   133篇
  1975年   106篇
  1974年   94篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Objectives:Physicians and other mental health experts are increasingly called on to assist the courts with the determination of testamentary capacity. We aim to improve the understanding of the retrospective assessment of testamentary capacity for medical experts in order to provide more useful reports for the court’s determinations and to provide a methodology for the retrospective assessment of testamentary capacity.Method:Medical experts with experience in the retrospective assessment of testamentary capacity collaborated with lawyers who practice estate litigation. The medical literature on the assessment of testamentary capacity was reviewed and integrated. The medical experts provided a clinical perspective, while the lawyers ensured that the case law and legal perspective were integrated into this review.Results:The focus and limitations of the medical expert are outlined including the need to be objective, nonpartisan, and fair. For the benefit of the court, the medical expert should describe the nature and severity of relevant medical, psychiatric, and cognitive disorders, and how they may impact on the specific criteria for testamentary capacity as defined by the leading case of Banks v Goodfellow. Medical experts should opine only on the issue of vulnerability to influence and defer to the court to determine the facts of the case regarding any influence that may have been exerted.Conclusions:Although the ultimate determination of testamentary capacity is a legal one, medical experts can help the court achieve the most informed legal decision by providing relevant information on clinical issues that may impact the criteria for testamentary capacity.  相似文献   
4.
5.
6.
Focused cardiac ultrasonography is performed by clinicians at the bedside and is used in time‐sensitive scenarios to evaluate a patient's cardiovascular status when comprehensive echocardiography is not immediately available. This simplified cardiac ultrasonography is often performed by noncardiologists using small, portable devices to augment the physical examination, triage patients, and direct management in both critical care and outpatient settings. However, as the use of focused cardiac ultrasonography continues to expand, careful consideration is required regarding training, scope of practice, impact on patient outcomes, and medicolegal implications. In this review, we examine some of the challenges with rapid uptake of this technique and explore the benefits and potential risk of focused cardiac ultrasonography. We propose possible mechanisms for cross‐specialty collaboration, quality improvement, and oversight.  相似文献   
7.

Objective

Helicobacter pylori infection is common among Asians. However, evidence in the recent years has demonstrated a decrease in the prevalence of H. pylori infection among children and adults worldwide. Our aim was to update its prevalence in symptomatic children in our locality in the recent 12?years and compared to the results of our previous review published in 2005.

Methods

A retrospective review was carried out between 2005 and 2017. All children who presented with dyspepsia or gastrointestinal bleeding and underwent oesophagogastroduodenoscopy with antral biopsy taken were included. Patient demographics, endoscopic, or histological diagnosis and the H. pylori status were recorded.

Main Results

A total of 602 patients were included. There was a statistically significant decreasing trend of H. pylori infection rate between 2005 and 2017 (p?=?0.003). The overall infection rate from this study was 12.8%, compared to 25.6% from our previous review. Overall failure of eradication with first-line antibiotic therapy has increased to 29.3% from 10% in our previous review.

Conclusion

There was a decrease in the prevalence of H. pylori infection among symptomatic children for the recent 12?years, comparing to our previous data from 2005. We hypothesize that the reduction in prevalence of H. pylori infection among adults and the decrease in the practice of sharing chopsticks during meals have led to a decrease in transmission of the bacteria among family members in Hong Kong. However, the failure of eradication with first line treatment was higher, possibly due to the increase in antibiotics usage and resistance.

Level of Evidence

III  相似文献   
8.
Although parenting behaviors are widely considered an important factor in the adjustment of children and adolescents with chronic physical health needs, few studies have addressed this topic as it pertains to youth with perinatally-acquired human immunodeficiency virus (PHIV). We examined profiles of child-centeredness, control through guilt, consistent discipline, and detachment, and whether these profiles differed in terms of parent- and youth-reported psychiatric disorder symptoms in a cohort of HIV infected youth (N?=?314). Latent profile analyses of caregiving behaviors were conducted separately for children (6–12 years) and adolescents (13–18 years). Two profiles were identified among children: (a) moderate caregiving (87%, n?=?130) and (b) high detachment caregiving (13%, n?=?19), and three profiles were identified among adolescents: (a) moderate caregiving (55%, n?=?88), (b) high detachment caregiving (19%, n?=?30), and (c) high control through guilt caregiving (26%, n?=?42). The high detachment and high control through guilt caregiving profiles displayed higher levels of parent-and youth-reported symptoms than the moderate caregiving profile. These findings suggest that caregiver behaviors of PHIV youth vary as a function of children’s developmental period and differ in terms of youth psychological symptoms.  相似文献   
9.
10.
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