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   2430篇
  免费   323篇
  国内免费   9篇
耳鼻咽喉   18篇
儿科学   144篇
妇产科学   16篇
基础医学   181篇
口腔科学   23篇
临床医学   259篇
内科学   499篇
皮肤病学   50篇
神经病学   719篇
特种医学   7篇
外科学   223篇
综合类   40篇
预防医学   217篇
眼科学   7篇
药学   194篇
中国医学   15篇
肿瘤学   150篇
  2024年   8篇
  2023年   92篇
  2022年   92篇
  2021年   124篇
  2020年   152篇
  2019年   161篇
  2018年   155篇
  2017年   128篇
  2016年   128篇
  2015年   89篇
  2014年   168篇
  2013年   236篇
  2012年   123篇
  2011年   116篇
  2010年   83篇
  2009年   106篇
  2008年   111篇
  2007年   116篇
  2006年   84篇
  2005年   74篇
  2004年   76篇
  2003年   68篇
  2002年   70篇
  2001年   45篇
  2000年   33篇
  1999年   20篇
  1998年   27篇
  1997年   23篇
  1996年   14篇
  1995年   16篇
  1994年   8篇
  1993年   5篇
  1992年   3篇
  1991年   3篇
  1990年   3篇
  1989年   1篇
  1988年   1篇
排序方式: 共有2762条查询结果,搜索用时 15 毫秒
1.
2.
3.
AimsTreatment decisions for older patients with breast cancer are complex and evidence is largely extrapolated from younger populations. Frailty and comorbidity need to be considered. We studied the baseline characteristics and treatment decisions in older patients in Christchurch with breast cancer and assessed survival outcomes and prognostic/discriminatory performance of several tools.Materials and methodsWe searched the Canterbury Breast Cancer Registry and identified patients aged 70 years or older at diagnosis with invasive, non-metastatic breast cancer between 1 June 2009 and 30 June 2015. We retrieved demographics, treatment and outcome information. Overall survival and breast cancer-specific survival were estimated. Tools analysing performance status and comorbidity were assessed for their prognostic and discriminatory power.ResultsIn total, 440 patients were identified. Primary surgery was carried out for 362 patients (82.3%): breast-conserving surgery in 114 (of whom 88.6% received radiation therapy); mastectomy in 248 (of whom 24.6% received radiation). Hormone therapy was given for 265 (71.1%) patients with oestrogen receptor-positive cancers. Two hundred and seventy-four (62.3%) patients received full standard treatment, which was associated with significantly improved 5-year survival and 5-year breast cancer-specific survival. The median estimated overall survival was 8.2 years (95% confidence interval 7.3–9.1 years). Of those who died, 71.3% of deaths were due to causes other than breast cancer or unknown causes. The comorbidity-adjusted life expectancy (CALE) showed partial prognostic accuracy. CALE, Charlson and Eastern Cooperative Oncology Group tools all showed discriminatory value.ConclusionIn this population-based series of older patients with breast cancer, showing high levels of primary and adjuvant treatment, patients were more likely to die of causes other than breast cancer. Performance status and comorbidity tools showed prognostic and discriminatory potential in this population supporting their use in treatment decision making. CALE showed the most potential to improve treatment decisions but requires validation in this population to improve prognostic accuracy.  相似文献   
4.
Aims: Studies conducted in first‐episode psychosis (FEP) samples avoid many biases. However, very few studies are based on epidemiological cohorts treated in specialized FEP services. The aim of this file audit study was to examine premorbid and baseline characteristics of a large epidemiological sample of FEP. Methods: File audit study of all patients admitted to the Early Psychosis Prevention and Intervention Centre between 1998 and 2000 using a specialized questionnaire. Results: There were 661 patient files included in the study. Premorbid evaluation revealed high rates of substance use disorder (74.1%), history of psychiatric disorder (47.5%), past traumatic events (82.7%) suicide attempts (14.3%) and family history of psychiatric illness (55.6%). Baseline characteristics revealed high intensity of illness (mean CGI 5.5), high prevalence of lack of insight (62%) and high rate of comorbidity (70%). Conclusion: High rates of traumatic events or episodes of mental illness before treatment for FEP must be considered when designing treatment approaches because a too narrow focus on positive psychotic symptoms will inevitably lead to incomplete treatment. Additionally, early intervention programmes need sufficient range of resources to address the multiple challenges presented by FEP patients such as high severity of illness, comorbidities and functional impairment. Finally, observation of an important degree of functional impairment despite short duration of untreated psychosis suggests that while early detection of FEP is a necessary step in early intervention, it may not be sufficient to improve functional recovery in psychosis and that efforts aimed at identifying people during the prodromal phase of psychotic disorders should be pursued.  相似文献   
5.
In a retrospective follow-up study over 11 years, the incidence and natural history of dementia was assessed in an institutionalized group of 144 people, aged 60 years and over, with mild to profound intellectual disability resulting from causes other than Down's syndrome. Age-related incidences, age at onset, duration and symptoms of dementia were comparable to those in the general population. The frequent and invalidating physical comorbidity (11 /11) hampered the diagnostic process in this group. The high prevalence of episodes of delirium (9/11) and depressive symptoms (8/11) as the first manifestations of dementia and/or during dementia might reflect increased vulnerability as compared to other ageing people.  相似文献   
6.
7.
BACKGROUND: A profile of Child Behavior Checklist(CBCL) T-scores>or=70 on the attention problems, aggression, and anxious/depressed subscales has been proposed to identify juvenile bipolar disorder(JBD). We tested this hypothesis in a population-based sample. METHODS: Data for this analysis come from a birth-records-based twin sample having semi-structured interview and CBCL data (N=1,346). We compared prevalence of DSM-IV psychiatric disorders and suicidal behaviors in CBCL-JBD and non-CBCL-JBD subjects. Twin modeling assessed genetic and environmental contributions to CBCL-JBD. Associations with DRD4 and DAT1 were examined using chi-square tests. RESULTS: The prevalence of CBCL-JBD was 2.5%. No subjects with CBCL-JBD met criteria for bipolar or other mood disorders. CBCL-JBD subjects had more oppositional defiant disorder (ODD), conduct disorder(CD), and attention deficit hyperactivity disorder(ADHD). The CBCL-JBD profile was uncommon in these disorders. CBCL-JBD subjects more frequently endorsed suicidal behaviors. The CBCL-JBD profile was heritable and associated with the number of DAT1 9-repeat 3' untranslated region alleles. CONCLUSIONS: The CBCL-JBD phenotype does not correspond with a semi-structured interview assessment of JBD. ADHD, CD, and ODD are common in children with CBCL-JBD but do not account for the profile. Increased suicidal behaviors indicate substantial impairment in CBCL-JBD subjects.  相似文献   
8.
In order to elucidate the psychiatric comorbidity of patients in alcohol and other substance use disorder treatment we examined a representative sample of such patients in Iceland (249 men and 102 women). Over 70% of pure alcoholics and over 90% of polysubstance users had comorbid diagnoses, a prevalence higher than in the Epidemiological Catchment Area study in the United States, but similar to clinical studies from North America. The most prevalent disorders were: affective (33%), anxiety (65%), antisocial personality disorder (28%) and psychosexual dysfunction (20%). Pure alcoholics and polysubstance users in studies on psychiatric comorbidity should be separated. Anxiety and affective disorders influence treatment seeking. Findings concerning the impact of psychiatric comorbidity on course should be comparable between North America and Europe.  相似文献   
9.
10.
Comorbidity is pervasive among both adult and child psychiatric disorders; however, the etiological mechanisms underlying the majority of comorbidities are unknown. This study used genetic linkage analysis to assess the etiology of comorbidity between reading disability (RD) and attention‐deficit hyperactivity disorder (ADHD), two common childhood disorders that frequently co‐occur. Sibling pairs (N = 85) were ascertained initially because at least one individual in each pair exhibited a history of reading difficulties. Univariate linkage analyses in sibling pairs selected for ADHD from within this RD‐ascertained sample suggested that a quantitative trait locus (QTL) on chromosome 6p is a susceptibility locus for ADHD. Because this QTL is in the same region as a well‐replicated QTL for reading disability, subsequent bivariate analyses were conducted to test if this QTL contributed to comorbidity between the two disorders. Analyses of data from sib pairs selected for reading deficits revealed suggestive bivariate linkage for ADHD and three measures of reading difficulty, indicating that comorbidity between RD and ADHD may be due at least in part to pleiotropic effects of a QTL on chromosome 6p. © 2002 Wiley‐Liss, Inc.  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