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   3332篇
  免费   249篇
  国内免费   7篇
耳鼻咽喉   23篇
儿科学   102篇
妇产科学   133篇
基础医学   471篇
口腔科学   38篇
临床医学   472篇
内科学   669篇
皮肤病学   88篇
神经病学   325篇
特种医学   50篇
外科学   356篇
综合类   38篇
一般理论   2篇
预防医学   446篇
眼科学   40篇
药学   168篇
中国医学   1篇
肿瘤学   166篇
  2024年   6篇
  2023年   53篇
  2022年   77篇
  2021年   153篇
  2020年   89篇
  2019年   147篇
  2018年   156篇
  2017年   90篇
  2016年   114篇
  2015年   109篇
  2014年   154篇
  2013年   177篇
  2012年   274篇
  2011年   278篇
  2010年   124篇
  2009年   114篇
  2008年   193篇
  2007年   214篇
  2006年   217篇
  2005年   191篇
  2004年   150篇
  2003年   126篇
  2002年   129篇
  2001年   21篇
  2000年   16篇
  1999年   13篇
  1998年   17篇
  1997年   13篇
  1996年   12篇
  1995年   10篇
  1994年   11篇
  1993年   11篇
  1992年   13篇
  1991年   10篇
  1990年   8篇
  1989年   9篇
  1988年   11篇
  1986年   7篇
  1985年   5篇
  1983年   7篇
  1982年   5篇
  1981年   6篇
  1980年   7篇
  1979年   3篇
  1978年   4篇
  1977年   3篇
  1974年   3篇
  1973年   2篇
  1972年   3篇
  1971年   2篇
排序方式: 共有3588条查询结果,搜索用时 31 毫秒
21.
ObjectivesFew women with ovarian cancer undergo genetic testing for the Breast and Ovarian Cancer susceptibility genes, BRCA1 and BRCA2. With the prospect of BRCA-directed therapeutics, we investigated ovarian cancer patients' knowledge and willingness to undergo genetic testing.MethodsAll ovarian cancer patients seen in the Gynecology Center of a cancer center and a private clinic were asked to complete an anonymous questionnaire regarding knowledge and willingness to undergo BRCA testing. Women who had prior genetic testing were asked not to participate. Data was analyzed using Fisher's exact test.ResultsTwo-hundred and thirty seven ovarian cancer patients voluntarily completed the questionnaire. Fifty-five percent (131/237) of participants had not heard of BRCA testing. Of Caucasian respondents, 51% were unaware of BRCA testing, compared to 70% of Hispanic and 88% of African American respondents (p = 0.008). Awareness was correlated with education (p < 0.001). Eighty-nine percent of participants were willing to be tested if it would directly affect their therapy and 86.9% would be tested to benefit their family. Seventy-four percent of patients would pay 20% of the cost of testing, only 25.1% would pay in full.ConclusionsA majority of women with ovarian cancer are not aware of the availability of BRCA testing. This lack of awareness is more profound in minorities. Despite lack of knowledge, most patients would undergo testing if it would impact their care. However, cost may be a barrier. Given the willingness of patients to undergo testing and the possibility of targeted therapy, clinicians who care for these patients should work to make appropriate genetic counseling referrals.  相似文献   
22.
Eight weeks after having laboratory-confirmed SARS-CoV-2 breakthrough infections, 2 otherwise healthy, fully immunized adolescent patients in the United States who were experiencing related signs and symptoms were diagnosed with multisystem inflammatory syndrome in children. Our findings indicate that COVID-19 vaccination does not completely protect adolescents against multisystem inflammatory syndrome.  相似文献   
23.
24.
A COVID-19 outbreak occurred among Cameron Peak Fire responders in Colorado, USA, during August 2020–January 2021. The Cameron Peak Fire was the largest recorded wildfire in Colorado history, lasting August–December 2020. At least 6,123 responders were involved, including 1,260 firefighters in 63 crews who mobilized to the fire camps. A total of 79 COVID-19 cases were identified among responders, and 273 close contacts were quarantined. State and local public health investigated the outbreak and coordinated with wildfire management teams to prevent disease spread. We performed whole-genome sequencing and applied social network analysis to visualize clusters and transmission dynamics. Phylogenetic analysis identified 8 lineages among sequenced specimens, implying multiple introductions. Social network analysis identified spread between and within crews. Strategies such as implementing symptom screening and testing of arriving responders, educating responders about overlapping symptoms of smoke inhalation and COVID-19, improving physical distancing of crews, and encouraging vaccinations are recommended.  相似文献   
25.
PURPOSE OF REVIEW: Combination antiretroviral therapy (ART) has turned HIV infection into a complex chronic disease. This article documents cancer risk among HIV-infected persons, reviews immune system effects of HIV infection in relation to cancer risk, discusses implications for cancer prevention, and suggests future research directions. RECENT FINDINGS: There has been a shift in the cancer spectrum from AIDS-defining cancers (ADC) to non-ADC, although the burden of ADC remains high. Although a high prevalence of non-HIV cancer risk factors among HIV-infected persons contributes to cancer risk, substantial evidence has accumulated in favor of an independent association between HIV-induced immunodeficiency and elevated risk of many specific cancer types, most of viral cause, although further work is needed to disentangle immunodeficiency and smoking effects for lung cancer, and immunodeficiency and hepatitis virus effects for liver cancer. Relationships between cancer risk and two other immune system hallmarks of HIV infection, chronic inflammation, and immune dysfunction/senescence, remain poorly understood. SUMMARY: Early, sustained ART is a crucial component of cancer prevention. Continued epidemiologic monitoring is needed to detect possible effects on cancer risk of specific ART classes or medications, long-term exposure to systemic inflammation or immune dysfunction, or earlier or more effective ART.  相似文献   
26.
27.
The aim of this study was to examine the sensitivity of the Assessment of Motor and Process Skills (AMPS) in discriminating between independent people, those with dementia of the Alzheimer's type (DAT) requiring minimal assistance to live in the community (DAT-min) and those with DAT requiring moderate to maximal assistance (DAT-mod). The subjects comprised 329 non-disabled older adults, 167 people with DAT-min and 292 with DAT-mod. The AMPS was used to measure the subjects' ADL motor and ADL process abilities. Significant main effects were seen for ADL motor and ADL process abilities. All three groups differed significantly in both motor and process mean ability measures and the proportion of people with DAT with ability measures below AMPS cut-off measures increased significantly as the functional level decreased. The ADL process scale was a more discriminative measure of ability to function in the community than was the ADL motor scale.  相似文献   
28.
A 1-group pretest–posttest design to assess for changes in outcomes at 10 weeks and 6 months was the method used to evaluate the standardized 6-session Chronic Disease Self Management Program (CDSMP) with low income, urban African American older adults. Participants included 153 older adults (primarily African American) with 1 or more chronic health conditions. Classes were provided in the community at senior citizen centers, senior housing, and churches. Significant improvements were noted in selected areas at 10 weeks and 6 months after the program completion. The CDSMP was feasible and well-received with the older adults who participated in the study.  相似文献   
29.

Background

While the 11-factor modified frailty index (mFI) has been shown to predict adverse outcomes in patients undergoing total joint arthroplasty, the 5-factor index has not been evaluated in this patient population. The goal of this study was to evaluate the utility of the mFI-5 as a predictor of morbidity and mortality in patients undergoing primary total hip and knee arthroplasty.

Methods

A retrospective analysis of the American College of Surgeons National Surgical Quality Improvement Program's database for patients undergoing total hip arthroplasty and total knee arthroplasty between the years 2005 and 2016 was conducted. The 5-factor score, which includes the presence of comorbid diabetes, hypertension, congestive heart failure, chronic obstructive pulmonary disease, and functional status, was calculated for each patient. Multivariate logistic regression models were used to assess the relationship between the mFI-5 and postoperative complications while controlling for demographic variables.

Results

One hundred forty thousand one hundred fifty-eight patients undergoing total hip arthroplasty and 226,398 patients undergoing total knee arthroplasty were identified. After adjusting for demographic variables and comorbid conditions, logistic regression analyses revealed that the mFI-5 was a strong predictor for total complications, Clavien-Dindo grade IV complications (cardiac arrest, myocardial infarction, septic shock, pulmonary embolism, postoperative dialysis, reintubation, and prolonged ventilator requirement), surgical site infections, readmission, and 30-day mortality (P < .001).

Conclusions

The mFI-5 is an independent predictor of postoperative complications including life-threatening medical complications, surgical site infections, hospital readmission, and 30-day mortality after primary hip and knee arthroplasty. This clinical tool can be used to identify high-risk surgical patients and guide preoperative counseling to optimize outcomes.

Level of Evidence

III.  相似文献   
30.

Therapist-report measures of evidence-based interventions have enormous potential utility as quality indicators in routine care; yet, few such tools have shown strong psychometric properties. This study describes reliability and validity characteristics of a therapist-report measure of family therapy techniques for treating adolescent conduct and substance use problems: Inventory of Therapy Techniques for Core Elements of Family Therapy (ITT-CEFT). Study participants included 31 staff therapists treating 68 adolescent clients in eight community-based mental health and substance use clinics. Therapists submitted ITT-CEFT checklists and companion audio recordings for 189 sessions. The ITT-CEFT contains 13 techniques identified as core elements of three manualized family therapy models that are empirically supported for the target group. Therapists also reported on their use of three motivational interventions, and independent observers coded the submitted recordings. ITT-CEFT factor validity was shown via confirmatory factor analyses of the tool’s theoretical structure. Derived modules were: Family Engagement (four items; Cronbach’s α?=?.72); Relational Orientation (five items; α?=?.74); and Interactional Change (four items; α?=?.66). Concurrent validity analyses showed fair-to-excellent therapist reliability compared to observer ratings (ICCs range .64–.75); they showed moderate therapist accuracy compared to observer mean scores, reflecting a tendency to overestimate delivery of the techniques. Discriminant validity analyses showed tool differentiation from motivational interventions. Results offer provisional evidence for the feasibility of using the therapist-report ITT-CEFT to anchor quality procedures for family therapy interventions in real-world settings.

Trial Registration: The parent clinical trial is registered at www.ClinicalTrials.gov, ID: NCT03342872 (registration date: 11.10.17).

  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