全文获取类型
收费全文 | 2591篇 |
免费 | 244篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 11篇 |
儿科学 | 75篇 |
妇产科学 | 114篇 |
基础医学 | 327篇 |
口腔科学 | 73篇 |
临床医学 | 551篇 |
内科学 | 428篇 |
皮肤病学 | 23篇 |
神经病学 | 146篇 |
特种医学 | 73篇 |
外科学 | 204篇 |
综合类 | 29篇 |
一般理论 | 5篇 |
预防医学 | 293篇 |
眼科学 | 78篇 |
药学 | 151篇 |
肿瘤学 | 261篇 |
出版年
2021年 | 35篇 |
2020年 | 15篇 |
2019年 | 47篇 |
2018年 | 55篇 |
2017年 | 35篇 |
2016年 | 34篇 |
2015年 | 42篇 |
2014年 | 59篇 |
2013年 | 131篇 |
2012年 | 161篇 |
2011年 | 163篇 |
2010年 | 95篇 |
2009年 | 91篇 |
2008年 | 164篇 |
2007年 | 181篇 |
2006年 | 176篇 |
2005年 | 189篇 |
2004年 | 164篇 |
2003年 | 163篇 |
2002年 | 143篇 |
2001年 | 25篇 |
2000年 | 18篇 |
1999年 | 20篇 |
1998年 | 37篇 |
1997年 | 27篇 |
1996年 | 31篇 |
1995年 | 28篇 |
1994年 | 22篇 |
1993年 | 23篇 |
1992年 | 29篇 |
1991年 | 20篇 |
1990年 | 25篇 |
1989年 | 11篇 |
1988年 | 16篇 |
1987年 | 19篇 |
1986年 | 12篇 |
1985年 | 22篇 |
1984年 | 12篇 |
1983年 | 15篇 |
1982年 | 27篇 |
1981年 | 23篇 |
1980年 | 26篇 |
1979年 | 11篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1976年 | 11篇 |
1975年 | 15篇 |
1974年 | 12篇 |
1973年 | 10篇 |
1972年 | 13篇 |
排序方式: 共有2842条查询结果,搜索用时 15 毫秒
61.
Seelwan Sathitratanacheewin Ruth A. Engelberg Lois Downey Robert Y. Lee James A. Fausto Helene Starks Ben Dunlap James Sibley William Lober Elizabeth T. Loggers Nita Khandelwal J. Randall Curtis 《Journal of pain and symptom management》2018,55(1):75-81
Context
Recent analyses of Medicare data show decreases over time in intensity of end-of-life care. Few studies exist regarding trends in intensity of end-of-life care for those under 65 years of age.Objectives
To examine recent temporal trends in place of death, and both hospital and intensive care unit (ICU) utilization, for age-stratified decedents with chronic, life-limiting diagnoses (<65 vs. ≥65 years) who received care in a large healthcare system.Methods
Retrospective cohort using death certificates and electronic health records for 22,068 patients with chronic illnesses who died between 2010 and 2015. We examined utilization overall and stratified by age using multiple regression.Results
The proportion of deaths at home did not change, but hospital admissions in the last 30 days of life decreased significantly from 2010 to 2015 (hospital b = ?0.026; CI = ?0.041, ?0.012). ICU admissions in the last 30 days also declined over time for the full sample and for patients aged 65 years or older (overall b = ?0.023; CI = ?0.039, ?0.007), but was not significant for younger decedents. Length of stay (LOS) did not decrease for those using the hospital or ICU.Conclusion
From 2010 to 2015, we observed a decrease in hospital admissions for all age groups and in ICU admissions for those over 65 years. As there were no changes in the proportion of patients with chronic illness who died at home nor in hospital or ICU LOS in the last 30 days, hospital and ICU admissions in the last 30 days may be a more responsive quality metric than site of death or LOS for palliative care interventions. 相似文献62.
Vitamin D Analogue: Potent Antiproliferative Effects on Cancer Cell Lines and Lack of Hypercalcemic Activity
下载免费PDF全文
![点击此处可从《Archiv der Pharmazie》网站下载免费的PDF全文](/ch/ext_images/free.gif)
63.
HIV Prevalence and Associated Factors Among Men Who have Sex with Men (MSM) in New Jersey,U.S., 2017
Wang Peng Wogayehu Afework Fahad Anindita Menschner Christopher Bolden Barbara Rosmarin-DeStefano Corey Raymond Henry F. 《AIDS and behavior》2022,26(5):1652-1659
AIDS and Behavior - This study assessed the HIV prevalence among MSM in the greater Newark New Jersey area including Essex, Hudson, Morris and Union Counties and examined correlates of HIV... 相似文献
64.
65.
66.
Gary P. Wormser Maria E. Aguero-Rosenfeld Mary E. Cox John Nowakowski Robert B. Nadelman Diane Holmgren Donna McKenna Susan Bittker Lois Zentmaier Denise Cooper Dionysios Liveris Ira Schwartz Harold W. Horowitz 《Journal of clinical microbiology》2013,51(3):954-958
Lyme disease is transmitted by the bite of certain Ixodes ticks, which can also transmit Anaplasma phagocytophilum, the cause of human granulocytic anaplasmosis (HGA). Although culture can be used to identify patients infected with A. phagocytophilum and is the microbiologic gold standard, few studies have evaluated culture-confirmed patients with HGA. We conducted a prospective study in which blood culture was used to detect HGA infection in patients with a compatible clinical illness. Early Lyme disease was defined by the presence of erythema migrans. The epidemiologic, clinical, and laboratory features of 44 patients with culture-confirmed HGA were compared with those of a convenience sample of 62 patients with early Lyme disease. Coinfected patients were excluded. Patients with HGA had more symptoms (P = 0.003) and had a higher body temperature on presentation (P < 0.001) than patients with early Lyme disease. HGA patients were also more likely to have a headache, dizziness, myalgias, abdominal pain, anorexia, leukopenia, lymphopenia, thrombocytopenia, or elevated liver enzymes. A direct correlation between the number of symptoms and the duration of illness at time of presentation (rho = 0.389, P = 0.009) was observed for HGA patients but not for patients with Lyme disease. In conclusion, although there are overlapping features, culture-confirmed HGA is a more severe illness than early Lyme disease. 相似文献
67.
68.
Lois J. Surgenor Sarah Maguire Pierre J. V. Beumont 《European eating disorders review》2004,12(2):94-100
Despite renewed interest in drop‐out from eating disorders treatment, few studies have investigated the issue in respect to the most expensive and intensive form of treatment, that is, inpatient treatment for anorexia nervosa (AN). This study investigates whether risk of treatment drop‐out can be determined from information routinely collected at point of admission. Using information from a multi‐site database collected in Australia and New Zealand, demographic and clinical data at point of admission were collated for 213 inpatient treatment episodes. One in five admissions ended with the patient unilaterally deciding to leave treatment without clinician endorsement. A lower body mass index, AN purging subtype and active fluid restriction made significant independent contributions to this risk. Drop‐out remains a highly disruptive method of discharge and while there is utility in predicting those most at risk, few variables commonly collated by clinicians contribute to their identification. The implications for clinical practice and future research are discussed. Copyright © 2003 John Wiley & Sons, Ltd and Eating Disorders Association. 相似文献
69.
Ranitidine is Effective Therapy for Erosive Esophagitis 总被引:2,自引:0,他引:2
Arthur R. Euler M.D. Robert H. Murdock Jr. M.A.T. Timothy H. Wilson M.S. Marianne T. Silver M.S. Susan E. Parker M.S.N. Lois Powers M.S. 《The American journal of gastroenterology》1993,88(4):520-524
Two ranitidine dosages were compared for the treatment of erosive esophagitis in a multicenter, double-blind, randomized, parallel-group, placebo-controlled study. Adults with endoscopically verified erosive esophagitis were treated with either ranitidine 150 mg four times daily (n = 106), ranitidine 300 mg four times daily (n = 106), or placebo (n = 116) for up to 12 wk. Patients were also encouraged to adhere to lifestyle modifications (e.g., to elevate the head of bed, etc). Erosive esophagitis healing, determined by endoscopy, was achieved in 69% and 62% of ranitidine-treated patients by 8 wk and in 79% and 74% by 12 wk (150 mg and 300 mg, respectively) compared with 28% of placebo-treated patients by 8 wk and 40% by 12 wk ( p < 0.001 ranitidine vs. placebo). Onset of heartburn relief occurred within 24 h of initiating either ranitidine dosage, and relief was maintained throughout the 12-wk study. Both ranitidine dosages displayed safety profiles similar to that of placebo. We conclude that ranitidine 150 mg or 300 mg administered four times daily is effective for healing erosive esophagitis and relieving its symptoms. 相似文献
70.
Melissa M. Kallas-Koeman Jason M. Kong Jennifer A. Klinke Sonia Butalia Abhay K. Lodha Ken I. Lim Qiuli M. Duan Lois E. Donovan 《Diabetologia》2014,57(4):681-689