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   3242篇
  免费   710篇
  国内免费   19篇
耳鼻咽喉   36篇
儿科学   781篇
妇产科学   12篇
基础医学   179篇
口腔科学   11篇
临床医学   756篇
内科学   534篇
皮肤病学   52篇
神经病学   80篇
特种医学   55篇
外科学   558篇
综合类   197篇
现状与发展   2篇
预防医学   264篇
眼科学   12篇
药学   228篇
  15篇
中国医学   120篇
肿瘤学   79篇
  2024年   19篇
  2023年   119篇
  2022年   76篇
  2021年   213篇
  2020年   299篇
  2019年   272篇
  2018年   270篇
  2017年   261篇
  2016年   206篇
  2015年   194篇
  2014年   252篇
  2013年   315篇
  2012年   161篇
  2011年   152篇
  2010年   170篇
  2009年   127篇
  2008年   133篇
  2007年   112篇
  2006年   122篇
  2005年   76篇
  2004年   56篇
  2003年   53篇
  2002年   50篇
  2001年   31篇
  2000年   29篇
  1999年   29篇
  1998年   26篇
  1997年   27篇
  1996年   22篇
  1995年   18篇
  1994年   19篇
  1993年   11篇
  1992年   8篇
  1991年   5篇
  1990年   6篇
  1989年   10篇
  1988年   1篇
  1987年   4篇
  1985年   4篇
  1984年   3篇
  1983年   3篇
  1980年   2篇
  1977年   1篇
  1976年   1篇
  1974年   2篇
  1972年   1篇
排序方式: 共有3971条查询结果,搜索用时 15 毫秒
71.
72.
To evaluate the impact of pedometer use on the physical activity (PA) and functional walking capacity (FWC) of adolescents with juvenile idiopathic arthritis (JIA) and lower extremity (LE) involvement. Twenty-seven adolescents, aged 11–19 years with JIA and LE involvement, participated in the three-phase pedometer study that introduced the use of a pedometer and an education seminar at 6 weeks. Measurements were taken at the baseline first visit and at weeks 6, 12, and 20. The primary outcome measure was the 6-minute walk test (6MWT). Thirteen completed the study. Six-minute walk distance (6MWD) significantly increased from baseline (458.0 ± 70.8 m) to the end of phase 1 (501.4 ± 59.8 m) (p = 0.035), prior to receiving the pedometer; and from baseline to the end of study (p = 0.0037). No significant changes in 6MWD were found between weeks 6 and 12 (intervention) (p = 0.77) or between weeks 12 and 20 (follow through phase) (p = 0.27). In adolescents with LE JIA, consistent guidance and support by rheumatology professionals appears to positively influence PA and measures of FWC as seen through improved 6MWD. There was insufficient evidence to show that pedometers further increased FWC or PA.  相似文献   
73.
BackgroundMoyamoya disease (MMD) is a progressive intracranial arteriopathy with high risk of stroke. Its impact on quality of life is unstudied. We surveyed children with moyamoya disease and compared their quality of life to chronically ill children and children with stroke to better understand the impact of this diagnosis.MethodsChildren with moyamoya disease aged seven to 17 years from Stanford's Moyamoya Clinic between June 2014 and March 2015 were included. Children with syndromic neurodevelopmental diagnoses were excluded. Patients were surveyed using the Pediatric Quality of Life 4.0, in addition to the Pediatric Stroke Outcome Measure or Recovery Recurrence Questionnaire. Mean scores were compared to normative data sets. Linear regression models compared total quality of life scores in patients with and without stroke, after adjusting for confounders.ResultsThis cross-sectional study included 30 children with moyamoya disease; ten were male, and the median age was 13.5 years (range, 7 to 17 years). Twenty children (67%) had a stroke, and 14 of these had good neurological outcome (70%). Mean parent-proxy Pediatric Quality of Life scores were lower in all domains compared to healthy controls (P < 0.05), and all scores were comparable to chronically ill children and children with non–moyamoya disease stroke. There was no significant difference in total quality of life between patients with and without stroke.ConclusionsEven in the absence of stroke, children with moyamoya disease have lower quality of life than healthy controls and a similar quality of life to chronically ill children and those with non–moyamoya disease stroke. Children with moyamoya disease would benefit from mental health support beyond what a mild physical presentation may indicate.  相似文献   
74.
Data were abstracted from the medical and social work charts of 20 newborns who were classified as boarder babies nd their mothers (n = 18) to identify biopsychosocial factors associated with boarding. The findings show that the mothers whose newborns remained in the hospital as boarders were usually drug users, had other children in out-of-home placement, and over half are periodically homeless. Most of these mothers also lacked informal social support. The major health problems of infants were prematurity and associated infections. The total number of infant boarding days was 195 for a total of $117,000 in unreimbursed costs to the hospital. Practice and program implications and directions for future research are discussed.  相似文献   
75.
目的 采用共词分析法对近5年来国内外儿童超说明书用药的研究现状进行可视化分析,展现该领域的研究情况,描绘儿童超说明书用药的研究趋势,为未来的研究提示可能的方向。方法 于2014年8月分别以主题词“儿童”及“超说明书用药”在CNKI数据库、以主题词“pediatric”及“off-label drug”在MEDLINE数据库进行文献检索及筛选,提取文献高频关键词并使用Excel 2013建立共现矩阵,使用Ucinet 6.2绘制可视化网络。结果 初步建立国内外儿科超说明书用药研究现状的可视化网络,反映了近年来该研究领域的热点及现状。结论 国内外儿童超说明书用药的现象都较常见。我国对儿童超说明书用药的关注始于近3年;而国外对于儿童超说明书的关注时间较长,研究范围覆盖广,且已有针对超说明书用药的临床试验。现阶段国内外都急需要对儿童超说明书用药进行规范化管理,及时进行相关临床试验以更新说明书关于儿童用药的部分,保证儿童患者的用药安全。  相似文献   
76.
Introduction: Pulmonary hypertension is a hemodynamic condition occurring rarely in pediatrics. Nevertheless, it is associated with significant morbidity and mortality. When characterized by progressive pulmonary vascular structural changes, the disease is called pulmonary arterial hypertension (PAH). It results in increased pulmonary vascular resistance and eventual right ventricular failure. In the vast majority of cases, pediatric PAH is idiopathic or associated with congenital heart disease, and, contrary to adult PAH, is rarely associated with connective tissue, portal hypertension, HIV infection or thromboembolic disease.

Areas covered: This article reviews the current drug therapies available for the management of pediatric PAH. These treatments target the recognized pathophysiological pathways of PAH with endothelin-1 receptor antagonists, prostacyclin analogs and PDE type 5 inhibitors. New treatments and explored pathways are briefly discussed.

Expert opinion: Although there is still no cure for PAH, quality of life and survival have been improved significantly with specific drug therapies. Nevertheless, management of pediatric PAH remains challenging, and depends mainly on results from adult clinical trials and pediatric experts. Further research on PAH-specific treatments in the pediatric population and data from international registries are needed to identify optimal therapeutic strategies and treatment goals in the pediatric population.  相似文献   

77.
Given the recognition that sleep may influence obesity risk, there is increasing interest in measuring sleep parameters within obesity studies. The goal of the current analyses was to determine whether the SenseWear® Pro3 Armband (armband), typically used to assess physical activity, is reliable at assessing sleep parameters. The armband was compared with the AMI Motionlogger® (actigraph), a validated activity monitor for sleep assessment, and with polysomnography, the gold standard for assessing sleep. Participants were 20 adolescents (mean age = 15.5 years) with a mean body mass index percentile of 63.7. All participants wore the armband and actigraph on their non‐dominant arm while in‐lab during a nocturnal polysomnographic recording (600 min). Epoch‐by‐epoch sleep/wake data and concordance of sleep parameters were examined. No significant sleep parameter differences were found between the armband and polysomnography; the actigraph tended to overestimate sleep and underestimate wake compared with polysomnography. Both devices showed high sleep sensitivity, but lower wake detection rates. Bland–Altman plots showed large individual differences in armband sleep parameter concordance rates. The armband did well estimating sleep overall, with group results more similar to polysomnography than the actigraph; however, the armband was less accurate at an individual level than the actigraph.  相似文献   
78.
79.
To describe a single‐center experience with kidney transplantation and then study some donor and recipient features that may impact on graft survival and urological complication rates. We reviewed our database searching for pediatric patients who underwent kidney transplantation from August 1985 through November 2012. Preoperative data and postoperative complications were recorded. Graft survival rates were analyzed and compared based on the type of donor, donor's age from deceased donors, and recipients' ESRD cause. Kaplan–Meier curves with log rank and Wilcoxon tests were used to perform the comparisons. There were 305 pediatric kidney transplants. The mean recipient's age was 11.7 yr. The mean follow‐up was 11.0 yr. Arterial and venous thrombosis rates were 1.6% and 2.3%, respectively, while urinary fistula and symptomatic vesicoureteral reflux were diagnosed in 2.9% and 3.6% of cases, respectively. Deceased kidney transplantation had a lower graft survival rate than living kidney transplantation (log rank, p = 0.005). Donor's age (p = 0.420) and ESRD cause (p = 0.679) were not significantly related to graft survival rate. In long‐term follow‐up, type of donor, but not donor's age, impacts on graft survival rate. ESRD cause has no impact on graft survival rate, showing that well‐evaluated recipients may have good outcomes.  相似文献   
80.

Background

Supratentorial PNETs (sPNET) are uncommon embryonal malignancies of the central nervous system whose prognosis has historically been poor. We evaluated the outcome and prognostic factors of children with sPNET treated prospectively on a Children's Oncology Group trial.

Procedure

Following surgery, patients received craniospinal radiotherapy with concurrent carboplatin followed by six months of maintenance chemotherapy with cyclophosphamide and vincristine.

Results

Five‐year overall survival (OS) and progression‐free survival (PFS) for all patients was 58 ± 7% and 48 ± 7%. For patients with pineoblastoma (n = 23), five‐year OS and PFS was 81 ± 9% and 62 ± 11%. Extent of resection but not M‐stage was prognostic. Five‐year OS and PFS for 37 patients with non‐pineal tumors (NPsPNET) was 44 ± 8% and 39 ± 8%, significantly worse than for PB (P = 0.055 and 0.009 respectively). Extent of resection and major radiotherapy deviations were prognostic. Five year OS was 59 +/? 11.4% for those undergoing complete resection versus 10.4 +/? 7% for those who did not (P = 0.017). Central pathologic review called 14 (38%) “classic” sPNET, 8 (22%) “undifferentiated” and 13 (35%) “malignant gliomas.” There was no significant difference between the subgroups, although survival distributions approached significance when the combined “classic” and “undifferentiated” group was compared to the “malignant gliomas.”

Conclusions

Carboplatin during RT followed by 6 months of non‐intensive chemotherapy is a feasible treatment strategy for patients with sPNET. Aggressive surgical resection should be attempted if feasible. The classification of supratentorial small cell malignancies can be difficult. Pediatr Blood Cancer 2015;62:776–783. © 2015 Wiley Periodicals, 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