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   16379篇
  免费   5420篇
  国内免费   33篇
耳鼻咽喉   516篇
儿科学   505篇
妇产科学   666篇
基础医学   97篇
口腔科学   1087篇
临床医学   3480篇
内科学   6100篇
皮肤病学   338篇
神经病学   709篇
特种医学   246篇
外科学   1752篇
综合类   16篇
现状与发展   2篇
预防医学   3375篇
眼科学   220篇
药学   187篇
肿瘤学   2536篇
  2024年   160篇
  2023年   1048篇
  2022年   361篇
  2021年   653篇
  2020年   1193篇
  2019年   401篇
  2018年   1096篇
  2017年   1174篇
  2016年   1411篇
  2015年   1365篇
  2014年   1933篇
  2013年   2114篇
  2012年   638篇
  2011年   552篇
  2010年   1085篇
  2009年   1494篇
  2008年   562篇
  2007年   354篇
  2006年   655篇
  2005年   278篇
  2004年   221篇
  2003年   149篇
  2002年   131篇
  2001年   264篇
  2000年   229篇
  1999年   241篇
  1998年   319篇
  1997年   245篇
  1996年   232篇
  1995年   191篇
  1994年   149篇
  1993年   109篇
  1992年   109篇
  1991年   88篇
  1990年   104篇
  1989年   81篇
  1988年   65篇
  1987年   48篇
  1986年   56篇
  1985年   45篇
  1984年   41篇
  1983年   39篇
  1982年   15篇
  1980年   16篇
  1979年   10篇
  1978年   12篇
  1977年   18篇
  1976年   11篇
  1975年   15篇
  1972年   14篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
Migratory and seasonal agricultural workers fill the labor needs of United States farmers. Although migrant workers are a culturally and ethnically diverse population, presently, they are predominantly immigrants of Hispanic ethnicity. Migrant farm workers are increasingly young, financially impoverished, male, undocumented immigrants from Mexico. Families with children constitute 45% of this population. The ecological context of migrant children’s lives is characterized by poverty, social isolation, heightened inter- and intra-national mobility, limited protections from occupational safety and health legislation, and health access barriers. Moreover, the linkage of citizenship and immigration status to the receipt of public insurance and selected social services benefits has the potential to increase access barriers for migrant workers and their families. Despite these obvious vulnerabilities, few health services research studies address this population. Most of what is known relates to adults, with very little known about migrant children’s health services utilization patterns or health morbidities. In the emergency department setting, the differential approach required to care for children, as compared to adults, must be modified further in order to address the unique needs of this vulnerable population. The effective delivery of acute care to the children of migratory agricultural workers requires awareness of and attention to their unique health access barriers, issues of continuity and compliance with care, and their unique health and injury risks.  相似文献   
102.
103.
104.
105.
Timely follow‐up for positive cancer screening results remains suboptimal, and the evidence base to inform decisions on optimizing the timeliness of diagnostic testing is unclear. This systematic review evaluated published studies regarding time to follow‐up after a positive screening for breast, cervical, colorectal, and lung cancers. The quality of available evidence was very low or low across cancers, with potential attenuated or reversed associations from confounding by indication in most studies. Overall, evidence suggested that the risk for poorer cancer outcomes rises with longer wait times that vary within and across cancer types, which supports performing diagnostic testing as soon as feasible after the positive result, but evidence for specific time targets is limited. Within these limitations, we provide our opinion on cancer‐specific recommendations for times to follow‐up and how existing guidelines relate to the current evidence. Thresholds set should consider patient worry, potential for loss to follow‐up with prolonged wait times, and available resources. Research is needed to better guide the timeliness of diagnostic follow‐up, including considerations for patient preferences and existing barriers, while addressing methodological weaknesses. Research is also needed to identify effective interventions for reducing wait times for diagnostic testing, particularly in underserved or low‐resource settings. CA Cancer J Clin 2018;68:199–216 . © 2018 American Cancer Society .  相似文献   
106.

BACKGROUND:

Health care outcomes for long‐term survivors of adolescent and young adult (AYA) cancer were compared with young adults without a cancer history, using the 2009 Behavioral Risk Factor Surveillance System data.

METHODS:

Eligible participants were 20 to 39 years of age. There were N = 979 who self‐reported a cancer diagnosis between the ages of 15 to 34 years and were at least 5 years from diagnosis (excluding nonmelanoma skin cancer). The remaining 67,216 participants with no cancer history were used as controls. Using multivariable regressions, relative risks and 95% confidence intervals were generated to examine the relationship of survivor status on indicators of poor health care (uninsured, no personal health care provider, no routine care, and avoiding seeing a doctor due to cost). Adjusted proportions were calculated by demographic groups. Results are weighted by Behavioral Risk Factor Surveillance System survey design.

RESULTS:

Although the proportion uninsured did not differ (21% of survivors vs 23% of controls), AYA survivors reported forgoing care due to cost at higher levels than controls (relative risk = 1.67, 95% CI = 1.44‐1.94). Cost barriers were particularly high for survivors aged 20 to 29 years (44% vs 16% of controls; P < .001) and female survivors (35% vs 18% of controls; P < .001). Survivors reporting poorer health had more cost barriers. Moreover, uninsured survivors tended to report lower use of health care than did controls.

CONCLUSIONS:

AYA cancer survivors may forgo health care due to cost barriers, potentially inhibiting the early detection of late effects. Expanding health insurance coverage for young cancer survivors may be insufficient without adequate strategies to reduce their medical cost burdens. Cancer 2012. © 2012 American Cancer Society.  相似文献   
107.
108.
Hepatocellular carcinoma (HCC) is one of the few cancers in which a continued increase in incidence has been observed over several years. As such, there has been a focus on safe and accurate diagnosis and the development of treatment algorithms that take into consideration the unique complexities of this patient population. In the past decade, there have been improvements in nonsurgical treatment platforms and better standardization with respect to the diagnosis and patient eligibility for liver transplant. How to navigate patients through the challenges of treatment is difficult and depends on several factors: 1) patient‐related variables such as comorbid conditions that influence treatment eligibility; 2) liver‐related variables such as Child‐Pugh score; and 3) tumor‐related variables such as size, number, pattern of spread within the liver, and vascular involvement. The objectives of this review are to put into perspective the current treatment options for patients with HCC, the unique advantages and disadvantages of each treatment approach, and the evidence that supports the introduction of sorafenib into the multidisciplinary management of HCC. CA Cancer J Clin 2012;. © 2012 American Cancer Society.  相似文献   
109.
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