全文获取类型
收费全文 | 10219篇 |
免费 | 724篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 94篇 |
儿科学 | 447篇 |
妇产科学 | 179篇 |
基础医学 | 1301篇 |
口腔科学 | 200篇 |
临床医学 | 974篇 |
内科学 | 2050篇 |
皮肤病学 | 118篇 |
神经病学 | 927篇 |
特种医学 | 349篇 |
外科学 | 1935篇 |
综合类 | 232篇 |
一般理论 | 5篇 |
预防医学 | 682篇 |
眼科学 | 187篇 |
药学 | 551篇 |
中国医学 | 20篇 |
肿瘤学 | 718篇 |
出版年
2023年 | 77篇 |
2022年 | 103篇 |
2021年 | 278篇 |
2020年 | 176篇 |
2019年 | 258篇 |
2018年 | 306篇 |
2017年 | 205篇 |
2016年 | 252篇 |
2015年 | 243篇 |
2014年 | 369篇 |
2013年 | 455篇 |
2012年 | 715篇 |
2011年 | 752篇 |
2010年 | 384篇 |
2009年 | 365篇 |
2008年 | 572篇 |
2007年 | 562篇 |
2006年 | 495篇 |
2005年 | 453篇 |
2004年 | 434篇 |
2003年 | 396篇 |
2002年 | 375篇 |
2001年 | 246篇 |
2000年 | 236篇 |
1999年 | 218篇 |
1998年 | 86篇 |
1997年 | 80篇 |
1996年 | 62篇 |
1995年 | 70篇 |
1994年 | 64篇 |
1993年 | 46篇 |
1992年 | 137篇 |
1991年 | 119篇 |
1990年 | 144篇 |
1989年 | 124篇 |
1988年 | 108篇 |
1987年 | 91篇 |
1986年 | 99篇 |
1985年 | 95篇 |
1984年 | 78篇 |
1983年 | 61篇 |
1982年 | 45篇 |
1981年 | 41篇 |
1979年 | 59篇 |
1978年 | 43篇 |
1977年 | 35篇 |
1976年 | 30篇 |
1974年 | 46篇 |
1972年 | 30篇 |
1971年 | 33篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
ABSTRACT Informal settlements remain a public health problem as they lack basic infrastructure. Furthermore, it is challenging to enforce public health regulations and protocols to prevent the spread of infection during a pandemic. This paper was set out to explore the impact of lockdown during COVID-19 among people living in informal settlements. An exploratory qualitative design was utilised. Purposive sampling was used to select research participants. In-depth one-to-one interviews were held involving 30 research participants through a WhatsApp online telephone platform. A thematic approach underpinned by the four stages of data analysis in interpretive phenomenological analysis was utilised to analyse the data. The study found that during the the research participants were affected by lack of space to practice social distancing, over-burdened infrastructure, lack of savings, loss of income and shortage of food, hunger and diseases, anxiety and depression and poor access to education. There is a need to prioritise the needs of informal settlers and endeavour to establish permanent homes. Health promotion and communication initiatives and pandemic awareness programmes are needed to mitigate the impact of lockdown during a pandemic in informal settlements. 相似文献
2.
A total of 117 manic-depressives who had been on lithium for a mean duration of 4.7 years were examined before lithium therapy and subsequently at intervals. Information relating to pre-lithium height and weight and current weight were determined and used to calculate the body mass index (BMI) for each individual. Other relevant variables such as age, sex, cumulative lithium dose, duration of therapy, thyroid profile and serum lithium levels were recorded. The results indicated that, although there was a nonsignificant increase in BMI for the whole population, lithium and sex were not significant predictors of any increase in BMI. In nearly 27% of patients BMI actually slightly decreased during lithium therapy. The overall conclusions from this study are that, in the population studied, lithium may not have exerted any pharmacological effects to increase BMI. 相似文献
3.
4.
Society of Geriatric Cardiology 总被引:3,自引:0,他引:3
5.
6.
J R A Duckett S Jain A Tamilselvi P A Moran D Richmond 《Journal of obstetrics and gynaecology》2004,24(7):785-793
The aim of the study was to describe the experience, current trends and management of incontinence surgery for urodynamic stress incontinence (USI) in the United Kingdom. The study was a postal questionnaire survey that was sent to a cohort of surgeons known to be performing continence surgery. The subjects addressed included the considered role of the surgeon, the total number and type of operations performed in the last year, urodynamics and physiotherapy prior to incontinence surgery, operative complications, postoperative advice and follow-up (lengths and methods). The response rate was 54%. Large variations were found in all areas. The survey provides evidence of the number of incontinence operations performed, potentially important trends and differences in the practice and management of incontinence in the United Kingdom. This survey may be helpful in making guidelines and standards for audit at regional, local and individual levels as well as recommendations for strategies to enhance professional expertise in urogynaecology in the United Kingdom. 相似文献
7.
8.
9.
We describe 3 patients with ureteral calculi who failed multiple extracorporeal shock wave lithotripsy treatments and whose stones could not be visualized by ureteroscopy despite radiological confirmation. We contend that these ureteral stones migrated submucosally and are refractory to the aforementioned treatment modalities. Each patient had a common presenting complaint of intermittent flank pain 5 years in duration, leading us to believe that long-standing stone impaction is a prerequisite for this entity. Our experience is reviewed. 相似文献
10.
Olfactory Neuroblastoma and Neuroendocrine Carcinoma of the Anterior Skull Base: Treatment Results at the M.D. Anderson Cancer Center
下载免费PDF全文
![点击此处可从《Skull base》网站下载免费的PDF全文](/ch/ext_images/free.gif)
John R. Austin Hazel Cebrun Mathew M. Kershisnik Adel K. El-Naggar Adam S. Garden Franco DeMonte Lawrence E. Ginsberg Scott M. Lippman Helmuth Goepfert 《Skull base》1996,6(1):1-8
Updated information on the pathologic characterization and treatment of olfactory neurobiastoma (ON) and neuroendocrine carcinoma (NEC) diseases is presented. A series of patients with ON or NEC was evaluated and retrospectively staged using the UCLA system. The parameters evaluated were symptoms, age, sex, risk factor assessment, stage of disease, treatment, and clinical outcome. The median follow-up was 3 years (range, 18 months to 23 years). The predominant therapy (63%) for ON was combined surgery and radiotherapy. Surgery alone or in combination with ancillary treatment was used in 58% of patients with NEC. For the most receat years of the study, patients with NEC have been treated successfully with combined chemotherapy and radiotherapy. Seventy percent of the patients with ON and 75% of the patients with NEC were clinically free of disease during the defined follow-up period. Surgical therapy consisting of a craniofacial resection combined with postoperative radiotherapy has resulted in good local and long-term control of ON. Our experience indicates that combined chemoradiation is an appropriate therapeutic approach for NEC. 相似文献