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   1431039篇
  免费   102150篇
  国内免费   2309篇
耳鼻咽喉   20679篇
儿科学   46906篇
妇产科学   41556篇
基础医学   209500篇
口腔科学   40096篇
临床医学   120879篇
内科学   283081篇
皮肤病学   30784篇
神经病学   114883篇
特种医学   56286篇
外国民族医学   370篇
外科学   219452篇
综合类   27302篇
现状与发展   1篇
一般理论   352篇
预防医学   103482篇
眼科学   32247篇
药学   108176篇
  1篇
中国医学   2783篇
肿瘤学   76682篇
  2018年   17098篇
  2017年   12613篇
  2016年   13760篇
  2015年   14943篇
  2014年   20088篇
  2013年   30926篇
  2012年   42386篇
  2011年   45621篇
  2010年   26716篇
  2009年   24258篇
  2008年   44174篇
  2007年   47376篇
  2006年   47501篇
  2005年   46680篇
  2004年   44703篇
  2003年   43640篇
  2002年   42920篇
  2001年   62859篇
  2000年   65377篇
  1999年   54246篇
  1998年   15729篇
  1997年   13988篇
  1996年   14016篇
  1995年   13144篇
  1994年   12487篇
  1993年   11592篇
  1992年   41953篇
  1991年   41161篇
  1990年   40668篇
  1989年   39443篇
  1988年   36767篇
  1987年   36041篇
  1986年   34328篇
  1985年   32853篇
  1984年   24529篇
  1983年   21376篇
  1982年   12897篇
  1981年   11407篇
  1979年   23093篇
  1978年   16301篇
  1977年   14165篇
  1976年   13337篇
  1975年   14607篇
  1974年   17081篇
  1973年   16433篇
  1972年   15610篇
  1971年   14530篇
  1970年   13494篇
  1969年   12978篇
  1968年   12234篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
International Journal of Clinical Oncology - Immune-checkpoint inhibitors (ICIs) are standard treatments for metastatic non-small cell lung cancer (NSCLC). Patients with poor performance status...  相似文献   
5.
6.
7.
8.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
9.
Tamoxifen prevents recurrence of breast cancer and is suggested for preventive risk-reducing therapy. Tamoxifen reduces mammographic density, a proxy for therapy response, but little is known about its effects in remodelling normal breast tissue. Our study, a substudy within the double-blinded dose-determination trial KARISMA, investigated tamoxifen-specific changes in breast tissue composition and histological markers in healthy women. We included 83 healthy women randomised to 6 months daily intake of 20, 10, 5, 2.5, 1 mg of tamoxifen or placebo. The groups were combined to “no dose” (0-1 mg), “low-dose” (2.5-5 mg) or “high-dose” (10-20 mg) of tamoxifen. Ultrasound-guided biopsies were collected before and after tamoxifen exposure. In each biopsy, epithelial, stromal and adipose tissues was quantified, and expression of epithelial and stromal Ki67, oestrogen receptor (ER) and progesterone receptor (PR) analysed. Mammographic density using STRATUS was measured at baseline and end-of-tamoxifen-exposure. We found that different doses of tamoxifen reduced mammographic density and glandular-epithelial area in premenopausal women and associated with reduced epithelium and increased adipose tissue. High-dose tamoxifen also decreased epithelial ER and PR expressions in premenopausal women. Premenopausal women with the greatest reduction in proliferation also had the greatest epithelial reduction. In postmenopausal women, high-dose tamoxifen decreased the epithelial area with no measurable density decrease. Tamoxifen at both low and high doses influences breast tissue composition and expression of histological markers in the normal breast. Our findings connect epithelial proliferation with tissue remodelling in premenopausal women and provide novel insights to understanding biological mechanisms of primary prevention with tamoxifen.  相似文献   
10.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  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