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   10193篇
  免费   1072篇
  国内免费   36篇
耳鼻咽喉   103篇
儿科学   304篇
妇产科学   255篇
基础医学   1425篇
口腔科学   332篇
临床医学   1273篇
内科学   1967篇
皮肤病学   123篇
神经病学   907篇
特种医学   485篇
外国民族医学   3篇
外科学   1263篇
综合类   217篇
一般理论   10篇
预防医学   1153篇
眼科学   110篇
药学   709篇
中国医学   3篇
肿瘤学   659篇
  2021年   106篇
  2020年   93篇
  2019年   141篇
  2018年   155篇
  2017年   117篇
  2016年   120篇
  2015年   166篇
  2014年   244篇
  2013年   291篇
  2012年   468篇
  2011年   530篇
  2010年   265篇
  2009年   296篇
  2008年   441篇
  2007年   449篇
  2006年   453篇
  2005年   442篇
  2004年   400篇
  2003年   375篇
  2002年   360篇
  2001年   361篇
  2000年   333篇
  1999年   265篇
  1998年   126篇
  1997年   132篇
  1996年   117篇
  1995年   138篇
  1994年   110篇
  1993年   112篇
  1992年   226篇
  1991年   234篇
  1990年   226篇
  1989年   208篇
  1988年   204篇
  1987年   217篇
  1986年   218篇
  1985年   202篇
  1984年   142篇
  1983年   135篇
  1982年   92篇
  1981年   98篇
  1980年   81篇
  1979年   143篇
  1978年   123篇
  1977年   101篇
  1976年   106篇
  1975年   80篇
  1974年   88篇
  1973年   94篇
  1972年   79篇
排序方式: 共有10000条查询结果,搜索用时 89 毫秒
1.
2.
Uptake of colorectal cancer screening remains suboptimal. Mailed fecal immunochemical testing (FIT) offers promise for increasing screening rates, but optimal strategies for implementation have not been well synthesized. In June 2019, the Centers for Disease Control and Prevention convened a meeting of subject matter experts and stakeholders to answer key questions regarding mailed FIT implementation in the United States. Points of agreement included: 1) primers, such as texts, telephone calls, and printed mailings before mailed FIT, appear to contribute to effectiveness; 2) invitation letters should be brief and easy to read, and the signatory should be tailored based on setting; 3) instructions for FIT completion should be simple and address challenges that may lead to failed laboratory processing, such as notation of collection date; 4) reminders delivered to initial noncompleters should be used to increase the FIT return rate; 5) data infrastructure should identify eligible patients and track each step in the outreach process, from primer delivery through abnormal FIT follow-up; 6) protocols and procedures such as navigation should be in place to promote colonoscopy after abnormal FIT; 7) a high-quality, 1-sample FIT should be used; 8) sustainability requires a program champion and organizational support for the work, including sufficient funding and external policies (such as quality reporting requirements) to drive commitment to program investment; and 9) the cost effectiveness of mailed FIT has been established. Participants concluded that mailed FIT is an effective and efficient strategy with great potential for increasing colorectal cancer screening in diverse health care settings if more widely implemented.  相似文献   
3.
Caregivers play an integral role in promoting children's emotion regulation, while children's individual physiology affects how they respond to the caregiving environment. Relatively little is known about how fathering influences toddler emotion regulation, particularly within African American and low-income communities, where risk related to the development of emotion regulation is higher. This study investigated relations among fathering, toddler parasympathetic regulation, and toddler emotion regulation in a sample of 92 families. Fathering was assessed during two interactions: engagement following a stressor during a triadic task and a dyadic play task. Respiratory sinus arrhythmia (resting and reactivity) was obtained as an index of toddler parasympathetic arousal. Findings demonstrated an association between fathers’ engagement poststressor and toddler emotion regulation. Toddler RSA moderated this association: toddlers with elevated levels of resting RSA benefitted from parenting engagement following a stressor. Fathering during play did not relate to toddler emotion regulation. The importance of fathering and physiologic contexts in early regulatory development is discussed.  相似文献   
4.
5.
This article discusses the variety of techniques available to gain safe exposure to intra-abdominal organs. In recent years there have been significant advances in these techniques with a move towards minimally invasive strategies as the gold standard of care. This article will discuss the various options available, including laparoscopy and traditional open access, as well as the use of robotics within abdominal surgery.  相似文献   
6.
7.

Background

Spontaneous spinal and intracranial subdural hematomas are rarely reported, especially occurring simultaneously. Anticoagulation use has been associated with spontaneous hemorrhages. Prompt diagnosis is required to prevent permanent neurological sequelae. In this case report, we describe a spontaneous spinal and intracranial subdural hematoma in a woman taking warfarin and initially presenting with severe vaginal pain.

Case Report

A 42-year-old woman who had a history of mechanical valve replacement and was therefore taking warfarin, came to an emergency department for relief of severe vaginal pain. Mild concurrent lumbar pain increased concern about spinal pathology, so magnetic resonance imaging of her spine was performed. It revealed a subdural hematoma extending from L1–S1 with arachnoiditis, which suggested intracranial pathology, though the patient had no complaint of a headache. Computed tomography of her brain demonstrated a large right subdural hemorrhage with midline shift. Subsequent imaging revealed no aneurysm or source of the intracranial bleeding. We concluded that the patient experienced spontaneous anticoagulation-related intracranial hemorrhage resulting in lumbar subdural hematoma and arachnoiditis with referred vaginal pain.

Why Should an Emergency Physician Be Aware of This?

Pelvic, vaginal, or perineal pain may be the presenting symptom in patients with lower spinal pathology. It is important to consider causes other than gynecological ones in the differential diagnosis of these patients, as well as to be cognizant of the relationship between spinal and intracranial subdural hemorrhages. In patients with back pain or radiating lumbar pain, especially coupled with neurological effects, clinicians should consider spinal subdural hemorrhage and arachnoiditis to expedite imaging studies and treatment of these rare entities.  相似文献   
8.
9.
IntroductionChildren with medical complexity frequently lack coordinated and family-centered care and are best cared for in a medical home.MethodWe assessed concordance between provider and family perceptions of care management improvements during a prospective, 3-year study of nine complex care clinics and 42 primary care clinics. Using a pre-post design, we compared provider and parent perceptions of changes in care coordination and family-centered care responses using paired t tests, Spearman rank correlations, and linear regression.ResultsProvider scores significantly increased in every domain (range: 14.1 points [data management], 23.0 points [chronic care management]; p < .001). Parent perceptions improved only for shared decision making improved significantly (2.2 points, p < .01).DiscussionThese results indicate that it is possible to improve the medical home for children with medical complexity through a quality improvement initiative, but that provider perception of the improvement may be greater than parents’ perceptions.  相似文献   
10.
ObjectiveTo describe the prevalence, clinical presentation and current treatment regimens of inflammatory bowel disease (IBD) in patients with primary immunodeficiency disorders (PIDs).MethodsA systematic review was conducted. The following databases were searched: MEDLINE, Embase, Web of Science, the Cochrane Library and Google Scholar.ResultsA total of 838 articles were identified, of which 36 were included in this review. The prevalence of IBD in PIDs ranges between 3.4% and 61.2%, depending on the underlying PID. Diarrhea and abdominal pain were reported in 64.3% and 52.4% of the patients, respectively. Colon ulceration was the most frequent finding on endoscopic evaluation, while cryptitis, granulomas, ulcerations and neutrophilic/lymphocytic infiltrates were the most frequently reported histopathological abnormalities. Described treatment regimens included oral corticosteroids and other oral immunosuppressive agents, including mesalazine, azathioprine and cyclosporin, leading to clinical improvement in the majority of patients. In case of treatment failure, biological therapies including TNF- α blocking agents, are considered.ConclusionsThe overall prevalence of IBD in patients with PID is high, but varies between different PIDs. Physicians should be aware of these complications and focus on characteristic symptoms to reduce diagnostic delay and delay in initiation of treatment. Treatment of IBD in PIDs depends on severity of symptoms and may differ between various PIDs based on distinct underlying pathogenesis. An individualized diagnostic and therapeutic approach is therefore warranted.  相似文献   
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