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   4885篇
  免费   113篇
  国内免费   36篇
耳鼻咽喉   70篇
儿科学   2044篇
妇产科学   64篇
基础医学   253篇
口腔科学   16篇
临床医学   468篇
内科学   565篇
皮肤病学   22篇
神经病学   168篇
特种医学   82篇
外科学   398篇
综合类   290篇
预防医学   260篇
眼科学   12篇
药学   205篇
  1篇
中国医学   48篇
肿瘤学   68篇
  2024年   20篇
  2023年   78篇
  2022年   163篇
  2021年   199篇
  2020年   154篇
  2019年   289篇
  2018年   234篇
  2017年   101篇
  2016年   105篇
  2015年   91篇
  2014年   250篇
  2013年   204篇
  2012年   122篇
  2011年   169篇
  2010年   139篇
  2009年   126篇
  2008年   138篇
  2007年   140篇
  2006年   100篇
  2005年   59篇
  2004年   35篇
  2003年   22篇
  2002年   19篇
  2001年   22篇
  2000年   20篇
  1999年   15篇
  1998年   11篇
  1997年   10篇
  1996年   9篇
  1995年   6篇
  1994年   8篇
  1993年   4篇
  1991年   4篇
  1990年   4篇
  1988年   6篇
  1987年   4篇
  1986年   4篇
  1985年   176篇
  1984年   213篇
  1983年   54篇
  1982年   179篇
  1981年   195篇
  1980年   166篇
  1979年   167篇
  1978年   165篇
  1977年   136篇
  1976年   153篇
  1975年   97篇
  1974年   133篇
  1973年   110篇
排序方式: 共有5034条查询结果,搜索用时 15 毫秒
71.

Background

Single site laparoscopy for appendectomy is a technique with several case series suggesting a cosmetic advantage, but without prospective comparative data. We conducted a prospective, randomized trial comparing single site laparoscopic appendectomy to the standard 3-port approach, including scar assessment at early and long-term follow-up.

Methods

Enrolled patients over 12 years old and parents of patients less than 12 years old were asked to complete the validated Patient Scar Assessment Questionnaire (PSAQ) at early follow-up around 6 weeks and by phone after 18 months. The PSAQ consists of 4 scored subscales: Appearance, Consciousness, Appearance Satisfaction, and Symptom Satisfaction. Each subscale has a set of questions with a 4-point categorical response (1 = most favorable, 4 = least favorable). The sum of the scores quantifies each subscale.

Results

Early questionnaires were obtained from 98 3-port and 100 single-site patients with the single-site approach producing superior overall scar assessment (P = 0.003). By telephone follow-up, questionnaires were completed by 49 3-port and 56 single-site patients at a median of 25 (18–32) months. In this longer-term follow-up, overall scar assessment was not significantly different between groups (P = 0.06).

Conclusion

Patients or parents express superior scar assessment with the single site approach at early follow-up, but this difference disappears in the long-term.  相似文献   
72.
73.

Objective

To assess the feasibility and appropriateness of magnetoencephalography (MEG) for both adult and pediatric studies, as well as for the developmental comparison of these factors across a wide range of ages.

Methods

For 45 subjects with ages from 1 to 24 years (infants, toddlers, school-age children and young adults), lead fields (LFs) of MEG sensors are computed using anatomically realistic boundary element models (BEMs) and individually-reconstructed cortical surfaces. Novel metrics are introduced to quantify MEG sensor focality.

Results

The variability of MEG focality is graphed as a function of brain volume and cortical area. Statistically significant differences in total cerebral volume, cortical area, MEG global sensitivity and LF focality are found between age groups.

Conclusions

Because MEG focality and sensitivity differ substantially across the age groups studied, the cortical LF maps explored here can provide important insights for the examination and interpretation of MEG signals from early childhood to young adulthood.

Significance

This is the first study to (1) investigate the relationship between MEG cortical LFs and brain volume as well as cortical area across development, and (2) compare LFs between subjects with different head sizes using detailed cortical reconstructions.  相似文献   
74.
IntroductionPain is defined as an unpleasant emotional and sensory experience associated with bodily harm or with situations that cause fear and anxiety. However, it is often undertreated in pediatric emergency departments. This study aims to assess the effectiveness of sedation-analgesia techniques, level of satisfaction among health care professionals and relatives, and agreement between the satisfaction of health care professionals and relatives.MethodsA cross-sectional design was conducted. Sociodemographic and clinical variables were recorded, together with those for effectiveness using the Face, Legs, Activity, Cry, and Consolability scale and the Wong-Baker FACES scale, and the satisfaction using the 10-point Likert scale. Stata 16.1 was used for data analysis.ResultsA total of 94 procedures were registered. The results suggested that these techniques were effective or mildly effective in only half of the cases. Satisfaction was considered good across the board, and the agreement between health care professionals (ie, pediatric nurses and pediatricians) was considered substantial. However, the agreement between health care professionals and relatives was moderate.DiscussionOur results suggested that the adequate management of pain in pediatric emergency departments is still a challenge, despite the availability of international guidelines. Future research lines should be focused on analyzing possible causes of the inefficacy of some sedation-analgesia techniques and the causes of the differences between the perspectives of health care professionals and relatives. These research lines may be useful to improve quality of care and pediatric patient comfort.  相似文献   
75.
76.
77.
78.
Although rare, both benign and malignant bladder tumors are occasionally encountered in the pediatric population. In the present article, the technique of transurethral needle biopsy, which utilizes an 18-gauge core biopsy instrument inserted through a 9.5 French offset pediatric cystoscope to obtain diagnostic biopsies, is described. This technique has been used successfully in two patients, both of whom had an inflammatory myofibroblastic tumor on biopsy and on final pathology from partial cystectomy. This provides an alternative technique, which may be used when a pediatric resectoscope is not available or in patients with a small caliber urethra.  相似文献   
79.
80.
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