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   1740篇
  免费   158篇
  国内免费   1篇
耳鼻咽喉   20篇
儿科学   75篇
妇产科学   28篇
基础医学   305篇
口腔科学   35篇
临床医学   136篇
内科学   363篇
皮肤病学   5篇
神经病学   113篇
特种医学   43篇
外科学   292篇
综合类   17篇
预防医学   116篇
眼科学   24篇
药学   71篇
肿瘤学   256篇
  2021年   9篇
  2020年   22篇
  2019年   18篇
  2018年   27篇
  2017年   22篇
  2016年   41篇
  2015年   22篇
  2014年   33篇
  2013年   56篇
  2012年   59篇
  2011年   79篇
  2010年   47篇
  2009年   39篇
  2008年   64篇
  2007年   59篇
  2006年   86篇
  2005年   84篇
  2004年   74篇
  2003年   41篇
  2002年   72篇
  2001年   75篇
  2000年   52篇
  1999年   48篇
  1998年   41篇
  1997年   22篇
  1996年   27篇
  1995年   30篇
  1994年   18篇
  1993年   15篇
  1992年   57篇
  1991年   46篇
  1990年   37篇
  1989年   40篇
  1988年   37篇
  1987年   30篇
  1986年   46篇
  1985年   47篇
  1984年   41篇
  1983年   28篇
  1982年   18篇
  1980年   12篇
  1979年   22篇
  1978年   13篇
  1977年   16篇
  1975年   14篇
  1974年   14篇
  1973年   12篇
  1972年   13篇
  1971年   11篇
  1968年   9篇
排序方式: 共有1899条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
OBJECTIVE: The Antiretroviral Treatment Access Study (ARTAS) assessed a case management intervention to improve linkage to care for persons recently receiving an HIV diagnosis. METHODS: Participants were recently diagnosed HIV-infected persons in Atlanta, Baltimore, Los Angeles and Miami. They were randomized to either standard of care (SOC) passive referral or case management (CM) for linkage to nearby HIV clinics. The SOC arm received information about HIV and local care resources; the CM intervention arm included up to five contacts with a case manager over a 90-day period. The outcome measure was self-reported attendance at an HIV care clinic at least twice over a 12-month period. RESULTS: A higher proportion of the 136 case-managed participants than the 137 SOC participants visited an HIV clinician at least once within 6 months [78 versus 60%; adjusted relative risk (RR(adj)), 1.36; P = 0.0005) and at least twice within 12 months (64 versus 49%; RR(adj), 1.41; P = 0.006). Individuals older than 40 years, Hispanic participants, individuals enrolled within 6 months of an HIV-seropositive test result and participants without recent crack cocaine use were all significantly more likely to have made two visits to an HIV care provider. We estimate the cost of such case management to be 600-1200 US dollars per client. CONCLUSION: A brief intervention by a case manager was associated with a significantly higher rate of successful linkage to HIV care. Brief case management is an affordable and effective resource that can be offered to HIV-infected clients soon after their HIV diagnosis.  相似文献   
55.
Syngeneic graft-versus-host disease (sGVHD) has been described after hematopoietic cell transplantation (HCT) but remains poorly defined. We retrospectively reviewed adult syngeneic HCTs at our center (1980-2002) for sGVHD to investigate incidence, morbidity, and risk factors with a primary focus on parity. Among 119 transplantations, there were 21 cases of biopsy-proven sGVHD. The cumulative incidence was 18%, with multiorgan involvement in 6 cases and 1 death. sGVHD was more frequent when the donor was parous (32%) than nulliparous (9%) or male (13%; P = .03) and when the recipient was parous (31%) than nulliparous (7%) or male (13%; P = .02). Other univariable risk factors included older age (P < .01), busulfan/melphalan/thiotepa conditioning (P < .01), interleukin-2 (P = .02), HLA-A26 (P = .03), and more recent transplantation year (P < .01). Overall, risk factors were similar to those described in GVHD. Although an independent effect of parity could not be completely separated from other factors, donor and recipient pregnancy history merits further investigation.   相似文献   
56.
To investigate the management of patients with community-acquired pneumonia (CAP) treated in hospital in Sweden, a multicentre retrospective cohort study was performed with medical record review of 982 patients (mean age 63 y) at 17 departments of infectious diseases at hospitals in Sweden. Information on antimicrobial therapy, demographic characteristics, comorbid conditions, physical examination findings, and laboratory and microbiological test results were recorded. Outcome measures were in-hospital mortality and length of hospital stay (LOS). Cultures were obtained from blood in 80% and from sputum in 22% of the patients. A microbiological aetiology was determined for 23% of the patients, with Streptococcus pneumoniae as the dominating agent (9%). The initial antibiotic treatment was mostly given intravenously (78%). Penicillin (50%) or a cephalosporin (30%) was the most common choice. Both of these drugs were usually given as a single agent. The overall mortality was 3.5% and the mean LOS was 6.4 d. Thus, the outcome was favourable despite the empirical antibiotic treatment having a narrow spectrum compared with the broader approach recommended in most recent guidelines on the management of CAP. These findings suggest that a majority of patients who are hospitalized with moderately severe pneumonia can be treated initially with penicillin alone.  相似文献   
57.
Radiation is the most effective treatment for localized lymphoma, but treatment of multifocal disease is limited by toxicity. Radioimmunotherapy (RIT) delivers tumoricidal radiation to multifocal sites, further augmenting response by dose-escalation. This phase II trial evaluated high-dose RIT and chemotherapy prior to autologous stem-cell transplant (ASCT) for high-risk, relapsed or refractory (R/R) B-cell non-Hodgkin lymphoma (NHL). The primary endpoint was progression free survival (PFS). Secondary endpoints were overall survival (OS), toxicity, and tolerability. Patients age < 60 years with R/R NHL expressing CD20 were eligible. Mantle cell lymphoma (MCL) patients could proceed to transplant in first remission. Patients received I-131-tositumomab delivered at ≤25Gy to critical normal organs, followed by etoposide, cyclophosphamide and ASCT. A group of 107 patients were treated including aggressive lymphoma (N = 29), indolent lymphoma (N = 45), and MCL (N = 33). After a median follow-up of 10.1 years, the 10-year PFS for the aggressive, indolent, and MCL groups were 62%, 64%, 43% respectively. The 10-year OS for the aggressive, indolent, and MCL groups were 61%, 71%, 48% respectively. Toxicities were similar to standard conditioning regimens and non-relapse mortality at 100 days was 2.8%. Late myeloid malignancies were seen in 6% of patients. High-dose I-131-tositumomab, etoposide and cyclophosphamide followed by ASCT appeared feasible, safe, and effective in treating NHL, with estimated PFS at 10-years of 43%-64%. In light of novel cellular therapies for R/R NHL, high-dose RIT-containing regimens yield comparable efficacy and safety and could be prospectively compared.  相似文献   
58.
59.
60.
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