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   47678篇
  免费   3666篇
  国内免费   165篇
耳鼻咽喉   713篇
儿科学   1132篇
妇产科学   748篇
基础医学   5916篇
口腔科学   776篇
临床医学   5340篇
内科学   9147篇
皮肤病学   627篇
神经病学   4213篇
特种医学   1842篇
外国民族医学   2篇
外科学   8263篇
综合类   784篇
现状与发展   1篇
一般理论   41篇
预防医学   3792篇
眼科学   1068篇
药学   3652篇
  1篇
中国医学   74篇
肿瘤学   3377篇
  2023年   288篇
  2022年   210篇
  2021年   1138篇
  2020年   666篇
  2019年   1222篇
  2018年   1436篇
  2017年   1046篇
  2016年   1066篇
  2015年   1297篇
  2014年   1904篇
  2013年   2409篇
  2012年   3703篇
  2011年   3946篇
  2010年   2158篇
  2009年   1824篇
  2008年   3198篇
  2007年   3529篇
  2006年   3337篇
  2005年   3198篇
  2004年   2795篇
  2003年   2777篇
  2002年   2463篇
  2001年   413篇
  2000年   287篇
  1999年   381篇
  1998年   430篇
  1997年   306篇
  1996年   250篇
  1995年   309篇
  1994年   260篇
  1993年   213篇
  1992年   207篇
  1991年   173篇
  1990年   177篇
  1989年   177篇
  1988年   165篇
  1987年   157篇
  1986年   124篇
  1985年   157篇
  1984年   172篇
  1983年   148篇
  1982年   168篇
  1981年   150篇
  1980年   161篇
  1979年   97篇
  1978年   99篇
  1977年   75篇
  1976年   70篇
  1975年   71篇
  1974年   56篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Journal of Digital Imaging - Scoliosis is a condition of abnormal lateral spinal curvature affecting an estimated 2 to 3% of the US population, or seven million people. The Cobb angle is the...  相似文献   
3.

Female Genital mutilation/cutting (FGM/C) is associated with enduring psychiatric complications. In this study, we investigate the rates of co-morbid abuses and polyvictimization experienced by survivors of FGM/C. This is a sub-analysis of a cohort study examining the patient population at the EMPOWER Center for Survivors of Sex Trafficking and Sexual Violence in New York City. A retrospective chart-review of electronic medical records was conducted for all consenting adult patients who had FGM/C and had an intake visit between January 16, 2014 and March 6, 2020. Of the 80 participants, ages ranged from 20 to 62 years with a mean of 37.4 (SD?=?9.1) years. In addition to FGM/C, participants were victims of physical abuse (43; 53.8%), emotional abuse (35; 43.8%), sexual abuse (35; 43.8%), forced marriage (20; 25%), child marriage (13; 16.3%), and sex trafficking (1; 1.4%). There was a high degree of polyvictimization, with 41 (51.2%) experiencing 3 or more of the aforementioned abuses. Having FGM/C on or after age 13 or having a higher total abuse score was also found to be strong predictors of depression and PTSD. The high rates of polyvictimization among survivors of FGM/C are associated with development of depression and PTSD. Despite co-morbid abuses, patients still attribute substantial psychiatric symptoms to their FGM/C. Health care providers should understand the high risk of polyvictimization when caring for this patient population.

  相似文献   
4.
5.
6.
Poly(ADP-ribosyl) polymerases (PARPs) are nuclear enzymes with roles in DNA damage recognition and repair. PARP1 inhibition enhances the effects of DNA-damaging agents like doxorubicin. We sought to determine the recommended phase two dose (RP2D) of veliparib with pegylated liposomal doxorubicin (PLD) in breast and recurrent gynecologic cancer patients. Veliparib and PLD were administered in a standard phase 1, 3 + 3 dose-escalation design starting at 50 mg veliparib BID on days 1–14 with PLD 40 mg/mg2 on day 1 of a 28-day cycle. Dose escalation proceeded in two strata: A (prior PLD exposure) and B (no prior PLD exposure). Patients underwent limited pharmacokinetic (PK) sampling; an expansion PK cohort was added. 44 patients with recurrent ovarian or triple negative breast cancer were enrolled. Median age 56 years; 23 patients BRCA mutation carriers; median prior regimens four. Patients received a median of four cycles of veliparib/PLD. Grade 3/4 toxicities were observed in 10% of patients. Antitumor activity was observed in both sporadic and BRCA-deficient cancers. Two BRCA mutation carriers had complete responses. Two BRCA patients developed oral squamous cell cancers after completing this regimen. PLD exposure was observed to be higher when veliparib doses were > 200 mg BID. The RP2D is 200 mg veliparib BID on days 1–14 with 40 mg/m2 PLD on day 1 of a 28-day cycle. Anti-tumor activity was seen in both strata. However, given development of long-term squamous cell cancers and the PK interaction observed, efforts should focus on other targeted combinations to improve efficacy.  相似文献   
7.
For someone with an outsized influence on a field he helped to create, Dan Callahan was anything but overbearing. Physically compact, thin, and wiry in older age, he spoke at the rapid speed of his mind. Soon after I met him—when I was on the cusp of what would become a year‐long residency at The Hastings Center—I found myself seated in his decidedly quaint living room. Dan told a story that evening, one of many that has stuck in my head. It seemed to encapsulate his moral mindset and, in a way, his broader vision for bioethics. I am sure he has told the story many times to many people, but here it is as I recall it.  相似文献   
8.

Objective

To determine the association between provider training level and postplacental intrauterine device (IUD) outcomes following insertion instruction by email only.

Study design

We conducted a single-center chart review of demographics, insertion and clinical outcomes within 6 months of delivery for 116 patients who underwent postplacental levonorgestrel 52?mg IUD placement from October 1, 2016, to March 31, 2017.

Results

We confirmed IUD retention, removal or expulsion in 87 of 116 (75.0%) patients by 6 months after delivery. Complete expulsion or removal for malposition occurred in 20 (23.0%) patients and more frequently after vaginal than cesarean delivery (30.2% vs. 4.2%, OR 9.93 [95% CI 1.25–78.96]) and when a postgraduate year (PGY) 1 physician placed the IUD compared to a PGY 2–4 or attending physician (37.5% vs. 14.5%, OR 3.52 [95% CI 1.25–9.94]).

Conclusion

Postplacental levonorgestrel 52?mg IUD expulsion rates are associated with provider training level as well as delivery route, though the individual association of each of these factors is difficult to ascertain given the high degree of collinearity between these two variables in our study.  相似文献   
9.
10.
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