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   475615篇
  免费   21127篇
  国内免费   837篇
耳鼻咽喉   6757篇
儿科学   17084篇
妇产科学   15672篇
基础医学   68106篇
口腔科学   12860篇
临床医学   38165篇
内科学   87739篇
皮肤病学   10521篇
神经病学   31805篇
特种医学   21633篇
外国民族医学   139篇
外科学   73385篇
综合类   8764篇
现状与发展   1篇
一般理论   161篇
预防医学   35273篇
眼科学   10955篇
药学   33461篇
  2篇
中国医学   912篇
肿瘤学   24184篇
  2018年   6963篇
  2017年   6387篇
  2016年   6111篇
  2015年   8128篇
  2014年   8617篇
  2013年   10374篇
  2012年   18376篇
  2011年   13793篇
  2010年   8130篇
  2009年   9158篇
  2008年   10477篇
  2007年   12025篇
  2006年   12120篇
  2005年   19693篇
  2004年   20825篇
  2003年   16049篇
  2002年   10945篇
  2001年   17165篇
  2000年   15139篇
  1999年   16608篇
  1998年   3490篇
  1997年   3020篇
  1996年   2948篇
  1995年   2879篇
  1992年   14453篇
  1991年   14790篇
  1990年   14806篇
  1989年   14330篇
  1988年   13107篇
  1987年   12685篇
  1986年   12135篇
  1985年   11244篇
  1984年   8019篇
  1983年   6764篇
  1982年   3377篇
  1980年   2765篇
  1979年   7923篇
  1978年   5405篇
  1977年   4384篇
  1976年   3925篇
  1975年   5132篇
  1974年   6209篇
  1973年   5921篇
  1972年   5690篇
  1971年   5509篇
  1970年   5236篇
  1969年   4903篇
  1968年   4645篇
  1967年   4412篇
  1966年   4052篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
43.

Aims

To examine the influence of pre-existing psychiatric disorder on the choice of treatment in patients with gynaecological cancer.

Materials and methods

The analyses were based on all patients who underwent surgical treatment for endometrial, ovarian or cervical cancer who were registered in the Danish Gynecological Cancer Database in the years 2007–2014 (3059 patients with ovarian cancer, 5100 patients with endometrial cancer and 1150 with cervical cancer). Logistic regression model and Cox regression model, adjusted for relevant confounders, were used to estimate the effect of pre-existing psychiatric disorder on the course of cancer treatment. Our outcomes were (i) presurgical oncological treatment, (ii) macroradical surgery for patients with ovarian cancer, (iii) radiation/chemotherapy within 30 days and 100 days after surgery and (iv) time from surgery to first oncological treatment.

Results

In the group of patients with ovarian cancer, more patients with a psychiatric disorder received macroradical surgery versus patients without a psychiatric disorder, corresponding to an adjusted odds ratio of 1.24 (95% confidence interval 0.62–2.41) and the chance for having oncological treatment within 100 days was odds ratio = 1.26 (95% confidence interval 0.77–2.10). As for patients with endometrial cancer, all outcome estimates were close to unity. The adjusted odds ratio for oncological treatment within 30 days after surgery in patients with cervical cancer with a history of psychiatric disorder was 0.20 (95% confidence interval 0.03–1.54).

Conclusions

We did not find any significant differences in the treatment of ovarian and endometrial cancer in patients with pre-existing psychiatric diagnoses. When it comes to oncological treatment, we suggest that increased attention should be paid to patients with cervical cancer having a pre-existing psychiatric diagnosis.  相似文献   
44.
Lung - Diaphragmatic paralysis (DP) is an important cause of dyspnea with many underlying etiologies; however, frequently no cause is identified despite extensive investigation. We hypothesized...  相似文献   
45.
46.
47.
48.
49.
Theory: Immersive simulation is a common mode of education for medical students. Observation of clinical simulations prior to participation is believed to be beneficial, though this is often a passive process. Active observation may be more beneficial. Hypotheses: The hypothesis tested in this study was that the active use of a simple checklist during observation of an immersive simulation would result in better participant performance in a subsequent scenario compared with passive observation alone. Methods: Medical students were randomized to either passive or active (with checklist) observation of an immersive simulation involving cardiac arrest prior to participating in their own simulation. Performance measures included time to cardiopulmonary resuscitation (CPR) and time to defibrillation and were compared between first and second scenarios as well as between passive and active observers. Results: Seventy-nine simulations involving 232 students were conducted. Mean time to CPR was 18 seconds (SD = 11.6) for those using the checklist and 24 seconds (SD = 15.8) for those who observed passively (M difference = 6 seconds), t(35) = 1.46, p =.153. Time to defibrillation was 94 seconds (SD = 26.4) for those using the checklist and 92 seconds (SD = 23.8) for those who observed passively (M difference = –2 seconds), t(38) =.21, p =.837. Time to CPR was 24 seconds (SD = 15.8) for passive observers and 31 seconds (SD = 21.0; M difference = 7 seconds), t(35) = 1.13, p =.265, for their first scenario counterparts. Time to CPR was 18 seconds (SD = 11.6) for active observers and 36 seconds (SD = 26.2; M difference = 18 seconds), t(24) = 2.81, p =.010, for their first scenario counterparts. Time to defibrillation was 92 seconds (SD = 23.8) for passive observers and 125 seconds (SD = 32.2; M difference = 33 seconds), t(33) = 3.63, p =.001, for their first scenario counterparts. Time to defibrillation was 94 seconds (SD = 26.4) for the active observers and 132 seconds (SD = 52.9; M difference = 38 seconds), t(28) =.46, p =.008, for their first scenario counterparts. Conclusions: Observation alone leads to improved performance in the management of a simulated cardiac arrest. The active use of a simple skills-based checklist during observation did not appear to improve performance over passive observation alone.  相似文献   
50.
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