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   37011篇
  免费   3220篇
  国内免费   671篇
耳鼻咽喉   488篇
儿科学   438篇
妇产科学   3848篇
基础医学   3420篇
口腔科学   314篇
临床医学   3542篇
内科学   3599篇
皮肤病学   328篇
神经病学   675篇
特种医学   1047篇
外科学   3375篇
综合类   4246篇
一般理论   2篇
预防医学   2748篇
眼科学   133篇
药学   2748篇
  19篇
中国医学   815篇
肿瘤学   9117篇
  2024年   343篇
  2023年   750篇
  2022年   1374篇
  2021年   1836篇
  2020年   1492篇
  2019年   1905篇
  2018年   1911篇
  2017年   1684篇
  2016年   1363篇
  2015年   1342篇
  2014年   2975篇
  2013年   2632篇
  2012年   2238篇
  2011年   2435篇
  2010年   1697篇
  2009年   1797篇
  2008年   1900篇
  2007年   1637篇
  2006年   1402篇
  2005年   1110篇
  2004年   1007篇
  2003年   778篇
  2002年   524篇
  2001年   562篇
  2000年   488篇
  1999年   429篇
  1998年   338篇
  1997年   311篇
  1996年   272篇
  1995年   260篇
  1994年   243篇
  1993年   172篇
  1992年   136篇
  1991年   97篇
  1990年   94篇
  1989年   105篇
  1988年   83篇
  1987年   77篇
  1986年   51篇
  1985年   131篇
  1984年   152篇
  1983年   117篇
  1982年   150篇
  1981年   107篇
  1980年   89篇
  1979年   83篇
  1978年   52篇
  1977年   31篇
  1976年   38篇
  1975年   29篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
ObjectivesParticipants in breast cancer screening programmes may benefit from early detection but may also be exposed to the risks of overdiagnosis and false positives. We surveyed a sample of Spanish women to assess knowledge, information sources, attitudes and psychosocial impact.Materials and methodsA total of 434 breast cancer screening programme participants aged 45–69 years were administered questionnaires regarding knowledge, information sources, attitudes and psychosocial impact. Scores of 5 or more (out of 10) and 12 or less (out of 24) were established as indicating adequate knowledge and a positive attitude, respectively. Psychosocial impact was measured using the Hospital Anxiety and Depression Scale and the Cancer Worry Scale.ResultsOnly 42 women (9.7%) had adequate knowledge. The mean (SD) knowledge score was 2.97 (1.16). Better educated women and women without previous false positives had higher scores. The main sources of information were television, press, Andalusian Health Service documentation and family and friends. Most participants (99.1%) had a positive attitude, with a mean (SD) score of 3.21 (2.66). Mean (SD) scores for anxiety, depression and cancer worry were 1.86 (3.26), 0.72 (1.99) and 9.4 (3.04), respectively.ConclusionWomen have a very positive attitude to breast cancer screening, but are poorly informed and use television as their main information source. They experience no negative psychosocial impact from participation in such programmes.  相似文献   
42.
BackgroundConcurrent endocrine therapy with chemotherapy had a concern of potential antagonism. However, gonadotropin-releasing hormone (GnRH) agonist has been used concurrently with chemotherapy to prevent premature ovarian failure for young breast cancer patients. The aim of this study was to determine the impact of concurrent use of GnRH agonists on relapse-free and overall survival, and to establish the oncologic safety of ovarian protection with GnRH agonists.MethodsPremenopausal women aged between 20 and 40 years who received adjuvant chemotherapy for breast cancer from January 2002 to April 2012 were classified into two groups; One treated with GnRH agonists for ovarian protection during chemotherapy, and the other without ovarian protection. A propensity score matching strategy was used to create matched sets of two groups with age, pathologic stage, hormone receptor, and Her2 status.ResultsA total of 101 patients treated with concurrent GnRH agonist during chemotherapy were compared with 335 propensity score matched patients. Among them, 81.2% were younger than 35 years and 58.4% were hormone responsive. Survival analysis using stratified Cox regression showed that women treated with concurrent GnRH agonists had better recurrence-free survival (adjusted Hazard ratio 0.21, p = 0.009; unadjusted Hazard ratio 0.33, p = 0.034).ConclusionsOvarian protection using GnRH agonists can be safely considered for young women with breast cancer in terms of oncologic outcomes. Further studies are needed to assess the long-term outcomes of concurrent GnRH agonist use with chemotherapy.  相似文献   
43.
GOALS OF WORK: The way to inform cancer patients varies widely among different countries. In most Mediterranean countries, the traditional approach has been of partial disclosure of the truth. The intent of our work was to find if the attitude in Italy has changed in recent years and if differences still exist among different geographical regions in our country. Both patients' and physicians' attitudes vary in Italy depending on geographical area. In the South, the focus is on traditional values and full involvement of patients' family, with limited communication to (and limited autonomy of) the patient. Such attitude is less pronounced in Central Italy, whereas the North is more oriented to open communication and full decisional autonomy of the patient. MATERIALS AND METHODS: Approximately 600 consecutive patients in three different centres in Northern, Central and Southern Italy (respectively, Udine, Ancona and Catanzaro) were asked to answer a 26-item questionnaire on communication aspects to investigate the quality of the information given and potential differences between geographical areas. RESULTS: Questionnaires were completed by 587 patients (median age 60 years, 57% women), mainly with gastrointestinal (32%) or breast cancer (30%). About 370 patients (63%) had active disease at time of interview. A high proportion of patients were correctly informed on diagnosis (86%) and therapy (84%). On the contrary, patients fully aware of their prognosis were only about 43%. Nevertheless, most patients (60%) stated they were completely satisfied with the information received. There were differences between geographical areas on various information aspects, with patients from Southern Italy being, in general, less informed. CONCLUSIONS: In Italy, the cultural attitude towards communication in oncology is changing on both the physician and the patient side. There are still significant geographical differences, but there is a general trend suggesting improved awareness about diagnosis and treatment, with the notable exception of prognosis.  相似文献   
44.

Objective

Prior reviews evaluating the role of antidepressants in cancer-related depression have drawn conflicting conclusions. These reviews have also not explored differences in efficacy and tolerability between antidepressants. We conducted a meta-analysis to address these limitations.

Method

We searched Medline (1948–2013), the Cochrane Library (1800–2013), the Cumulative Index to Nursing and Allied Health Literature (1986–2013), ClinicalTrials.gov (2013) and meeting abstracts. We included randomized trials comparing antidepressants to placebo or no treatment for cancer-related depression. We used random effects to calculate standardized mean differences (SMD).

Results

Of 5178 potentially eligible citations, 9 trials (1169 subjects) met inclusion criteria. Trials of mianserin found a robust reduction in depression scores at ≥ 4 weeks of treatment (SMD: 0.60, 95% confidence interval (CI): 0.24–0.95). Similar, but less robust, results were observed with paroxetine (SMD: 0.22, 95% CI: 0.01–0.42) and fluoxetine (SMD 0.34, 95% CI: 0.02–0.66). Conversely, there was no advantage with amitriptyline or desipramine. Compared to placebo, the odds of dropping out due to side effect were higher with fluoxetine and paroxetine and lower with mianserin. Methodological quality was moderate.

Conclusions

Paroxetine, fluoxetine and mianserin improve cancer-related depression but may vary in efficacy and tolerability. High-quality, randomized trials of newer antidepressant agents are needed to identify optimal treatments for managing cancer-related depression.  相似文献   
45.
The purpose of these studies was to determine the effects of single session music therapy on inpatients in an adult bone marrow transplant unit. In Study 1, the researchers examined the effects of patient-preferred live music on anxiety, nausea, fatigue, pain, and relaxation for hospitalized patients (N = 50) recovering from a bone marrow transplant utilizing a pretest, posttest, and follow-up design with Likert-Type Scales. In Study 2, the researchers utilized a randomized controlled trial with pre and posttests to determine how music therapy might effect fatigue (N = 18). In Study 1, results were significant for relaxation, anxiety, and fatigue from pre to posttest. Although ratings tended to worsen slightly from posttest to follow-up, follow-up measurements maintained an improvement when compared with pretest scores. Results of Study 2 indicated no significant differences between- or within-group differences concerning fatigue. However, analyses of mean fatigue data indicated a slight decrease from pre to posttest for experimental participants and a slight increase from pre to posttest for control participants. Results of both studies indicate that a single music therapy session can have a positive effect on inpatients recovering from bone marrow transplants. Implications for clinical practice, limitations of the study, and suggestions for future research are provided.  相似文献   
46.
ObjectivesTo summarize the current status of clinicopathological and molecular markers for the prediction of recurrence or progression or both in non–muscle-invasive and survival in muscle-invasive urothelial bladder cancer, to address the reproducibility of pathology and molecular markers, and to provide directions toward implementation of molecular markers in future clinical decision making.Methods and materialsImmunohistochemistry, gene signatures, and FGFR3-based molecular grading were used as molecular examples focussing on prognostics and issues related to robustness of pathological and molecular assays.ResultsThe role of molecular markers to predict recurrence is limited, as clinical variables are currently more important. The prediction of progression and survival using molecular markers holds considerable promise. Despite a plethora of prognostic (clinical and molecular) marker studies, reproducibility of pathology and molecular assays has been understudied, and lack of reproducibility is probably the main reason that individual prediction of disease outcome is currently not reliable.ConclusionsMolecular markers are promising to predict progression and survival, but not recurrence. However, none of these are used in the daily clinical routine because of reproducibility issues. Future studies should focus on reproducibility of marker assessment and consistency of study results by incorporating scoring systems to reduce heterogeneity of reporting. This may ultimately lead to incorporation of molecular markers in clinical practice.  相似文献   
47.
ObjectivesTreating high-risk prostate cancer (CaP) with definitive therapy improves survival. We evaluated whether having health insurance reduces racial disparities in the use of definitive therapy for high-risk CaP.Materials and methodsThe Surveillance, Epidemiology, and End Results Program was used to identify 70,006 men with localized high-risk CaP (prostate-specific antigen level >20 ng/ml or Gleason score 8–10 or stage>cT3a) diagnosed from 2007 to 2010. We used multivariable logistic regression to analyze the 64,277 patients with complete data to determine the factors associated with receipt of definitive therapy.ResultsCompared with white men, African American (AA) men were significantly less likely to receive definitive treatment (adjusted odds ratio [AOR] = 0.60; 95% CI: 0.56–0.64; P<0.001) after adjusting for sociodemographics and known CaP prognostic factors. There was a significant interaction between race and insurance status (Pinteraction = 0.01) such that insurance coverage was associated with a reduction in racial disparity between AA and white patients regarding receipt of definitive therapy. Specifically, the AOR for definitive treatment for AA vs. white was 0.38 (95% CI: 0.27–0.54, P<0.001) among uninsured men, whereas the AOR was 0.62 (95% CI: 0.57–0.66, P<0.001) among insured men.ConclusionsAA men with high-risk CaP were significantly less likely to receive potentially life-saving definitive treatment when compared with white men. Having health insurance was associated with a reduction in this racial treatment disparity, suggesting that expansion of health insurance coverage may help reduce racial disparities in the management of aggressive cancers.  相似文献   
48.
Personalized medicine has been touted as a revolutionary form of cancer care. It has been portrayed as precision medicine, targeting with deadly accuracy cancer cells and sparing patients the debilitating broad-spectrum side effects of more traditional forms of cancer therapy. But personalized medicine still has its costs to patients and society, both moral and economic costs. How to recognize and address those issues will be the focus of this essay. We start with these questions: Does everyone faced with cancer have a moral right to the most effective cancer care available, no matter what the cost, no matter whether a particular individual has the personal ability to pay for that care or not? Or are there limits to the cancer care that anyone has a right to at social expense? If so, what are those limits and how are those limits to be determined? Are those limits a matter of both morality and economics? I will answer this last question in the affirmative. This is what I refer to as the “Just Caring” problem in health care.  相似文献   
49.
50.
Steinmann pins are known to be used as a shoulder stabilisation device in recurrent dislocation. Although rare, their potential to migrate within the thorax has been reported. We present the case of an 87-year-old man who was treated for recurrent left shoulder dislocation with pinning using a Steinmann pin. He presented eight days postoperatively with the pin impaling the aortic adventitia. To our knowledge, this is only the fifth case report of such an event. Awareness of this complication and attempts to prevent its occurrence are critical as the outcome can be fatal.  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