全文获取类型
收费全文 | 28901篇 |
免费 | 1870篇 |
国内免费 | 70篇 |
专业分类
耳鼻咽喉 | 252篇 |
儿科学 | 679篇 |
妇产科学 | 526篇 |
基础医学 | 4095篇 |
口腔科学 | 666篇 |
临床医学 | 2712篇 |
内科学 | 5494篇 |
皮肤病学 | 490篇 |
神经病学 | 3177篇 |
特种医学 | 1163篇 |
外国民族医学 | 57篇 |
外科学 | 4008篇 |
综合类 | 370篇 |
一般理论 | 10篇 |
预防医学 | 2263篇 |
眼科学 | 820篇 |
药学 | 1973篇 |
中国医学 | 32篇 |
肿瘤学 | 2054篇 |
出版年
2022年 | 194篇 |
2021年 | 394篇 |
2020年 | 239篇 |
2019年 | 394篇 |
2018年 | 442篇 |
2017年 | 370篇 |
2016年 | 416篇 |
2015年 | 561篇 |
2014年 | 735篇 |
2013年 | 1110篇 |
2012年 | 1627篇 |
2011年 | 1682篇 |
2010年 | 911篇 |
2009年 | 861篇 |
2008年 | 1590篇 |
2007年 | 1700篇 |
2006年 | 1630篇 |
2005年 | 1661篇 |
2004年 | 1571篇 |
2003年 | 1474篇 |
2002年 | 1448篇 |
2001年 | 439篇 |
2000年 | 376篇 |
1999年 | 392篇 |
1998年 | 322篇 |
1997年 | 307篇 |
1996年 | 274篇 |
1995年 | 256篇 |
1994年 | 227篇 |
1993年 | 231篇 |
1992年 | 259篇 |
1991年 | 240篇 |
1990年 | 216篇 |
1989年 | 222篇 |
1988年 | 207篇 |
1987年 | 223篇 |
1986年 | 187篇 |
1985年 | 195篇 |
1984年 | 248篇 |
1983年 | 205篇 |
1982年 | 236篇 |
1981年 | 219篇 |
1980年 | 199篇 |
1979年 | 185篇 |
1978年 | 156篇 |
1977年 | 114篇 |
1976年 | 150篇 |
1975年 | 133篇 |
1974年 | 158篇 |
1973年 | 122篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
S D Walter 《American journal of epidemiology》1992,136(6):730-741
Regional patterns of health data such as cancer incidence rates are often examined for evidence of environmental effects. In this paper, three measures of spatial clustering are evaluated for use with epidemiologic data. In particular, the effects of variation in regional population structure on the distribution of these measures is considered. It is shown that substantial bias occurs if variation in regional population size is ignored (as has occurred in previous analyses). On the other hand, the methods are robust to small case frequencies and to variation in the regional age distribution. It is recommended that these regional differences be routinely taken into account, which can be done with relatively little additional computation. A companion paper (Walter SD. The analysis of regional patterns in health data. II. The power to detect environmental effects. 相似文献
62.
63.
Clemens Aigner Peter Jaksch Samy Mazhar Kriztina Czebe Gabriel Marta Sharokh Taghavi Georg Lang Walter Klepetko 《European journal of cardio-thoracic surgery》2004,25(2):184-187
OBJECTIVES: The use of OKT3 for treatment of advanced high-grade acute rejection episodes eventually can result in cytokine release and consecutive pulmonary edema. Temporary extracorporeal membrane oxygenation (ECMO) bridging can be used to overcome this crucial period before the beneficial effects of OKT3 can be observed. METHODS: We summarize our experience with three patients, who underwent lung transplantation and presented with severe acute rejection episodes. OKT3 had to be initiated due to insufficient response to standard rejection therapy with corticosteroids. Upon initiation of OKT3 treatment, a massive life-threatening deterioration of lung function in spite of heavily invasive respirator treatment was seen and temporary ECMO support was imperative to support graft function. Results of this treatment were retrospectively reviewed. RESULTS: In all cases femoro-femoral veno-arterial ECMO was used for support of the impaired graft and after a period of 4-5 days led to a massive improvement of graft function. In the further course two patients could be discharged from hospital and are still alive 30 and 36 months, respectively, after the described incident. One patient died 4 months later due to liver failure. CONCLUSIONS: We conclude that the use of ECMO support in patients experiencing significant side effects from OKT3 therapy is a useful and effective therapeutic tool to overcome the initial critical period until the lung has sufficiently recovered. 相似文献
64.
ESTS guidelines for intraoperative lymph node staging in non-small cell lung cancer. 总被引:3,自引:0,他引:3
Didier Lardinois Paul De Leyn Paul Van Schil Ramon Rami Porta David Waller Bernward Passlick Marcin Zielinski Toni Lerut Walter Weder 《European journal of cardio-thoracic surgery》2006,30(5):787-792
The European Society of Thoracic Surgeons (ESTS) organized a workshop dealing with lymph node staging in non-small cell lung cancer. The objective of this workshop was to develop guidelines for definitions and the surgical procedures of intraoperative lymph node staging, and the pathologic evaluation of resected lymph nodes in patients with non-small cell lung cancer (NSCLC). Relevant peer-reviewed publications on the subjects, the experience of the participants, and the opinion of the ESTS members contributing on line, were used to reach a consensus. Systematic nodal dissection is recommended in all cases to ensure complete resection. Lobe-specific systematic nodal dissection is acceptable for peripheral squamous T1 tumors, if hilar and interlobar nodes are negative on frozen section studies; it implies removal of, at least, three hilar and interlobar nodes and three mediastinal nodes from three stations in which the subcarinal is always included. Selected lymph node biopsies and sampling are justified to prove nodal involvement when resection is not possible. Pathologic evaluation includes all lymph nodes resected separately and those remaining in the lung specimen. Sections are done at the site of gross abnormalities. If macroscopic inspection does not detect any abnormal site, 2-mm slices of the nodes in the longitudinal plane are recommended. Routine search for micrometastases or isolated tumor cells in hematoxylin-eosin negative nodes would be desirable. Randomized controlled trials to evaluate adjuvant therapies for patients with these conditions are recommended. The adherence to these guidelines will standardize the intraoperative lymph node staging and pathologic evaluation, and improve pathologic staging, which will help decide on the best adjuvant therapy. 相似文献
65.
66.
67.
Demetrius M Maraganore Matthew J Farrer Timothy G Lesnick Mariza de Andrade James H Bower Dena Hernandez John A Hardy Walter A Rocca 《Movement disorders》2003,18(11):1233-1239
We conducted a case-control study of the alpha-synuclein-interacting protein gene (SNCAIP, also known as synphilin-1) and Parkinson's disease (PD). A total of 319 PD cases and 195 controls were genotyped for four SNCAIP variants, including a microsatellite repeat in intron 4 and three restriction fragment length polymorphisms (RFLP) proximal to the 5' terminal of exons 1, 4, and 6. None of the variants were found associated with PD overall. Global score statistics were not significant for four, three, and two loci haplotypes. All four loci were in linkage disequilibrium for cases, controls, or both groups combined (P < 0.0001). Recursive partitioning showed no interactions between variants of the SNCAIP gene and variants of the alpha-synuclein gene (SNCA) or the parkin (PARK2) gene. 相似文献
68.
The Workup for Bariatric Surgery Does Not Require a Routine Upper Gastrointestinal Series 总被引:1,自引:0,他引:1
Andrew J Ghassemian Kenneth G MacDonald MD Paul G Cunningham MD Melvin Swanson PhD Brenda M Brown MRA Patricia G Morris BSN Walter J Pories MD 《Obesity surgery》1997,7(1):16-18
Background: Morbid obesity is a serious disease that afflicts over five million Americans, threatening their health with such
co-morbidities as diabetes, arthritis, pulmonary failure and stroke. Surgery is the only effective therapy, providing long-term
control of weight, diabetes, pulmonary failure, and hypertension for as long as 14 years. Because the operation presents a
major expense, this study examined whether X-ray examination of the gut could be omitted safely as a cost-saving measure.
Methods: The records of 814 consecutive morbidly obese patients who underwent gastric bypass were reviewed to determine: (1)
whether these individuals had undergone an upper gastro-intestinal (GI) series, and (2) if these studies influenced therapy
or caused cancellation or postponement of surgery. Results: Of the 814 patients, 657 (80.7%) underwent a preoperative GI radiography.
Of these examinations, 393 (59.8%) were normal, with the following abnormalities in the remaining 264: hiatal hernia, 164;
esophageal reflux, 39; Schatzki's ring, 18; small bowel diverticula, four; renal stones, four; malrotation, three; gall stones,
two; pyloric ulcer, one; possible pelvic mass, one; calcified leiomyoma, one; and dysphagial lusoria, one. None of these findings
resulted in cancellation or a delay in surgery. Conclusions: The upper GI series can be safely omitted from the routine preoperative
evaluation of patients undergoing gastric bypass. At a cost of $741.00 per examination, this change represents significant
potential savings. Similar evaluations of other routine preoperative tests may well provide a better basis for the evaluation
of these complex patients. 相似文献
69.
A 2?year-old boy had the onset of pain and swelling of his penis during the past 3 days. The swelling and pain increased significantly within the past 24 hours. The child's penis is shown in the Figure. DENOUEMENT AND DISCUSSION PARAPHIMOSIS Paraphimosis is an urologic emergency that results when the foreskin is retracted away from the glans penis and cannot be reduced to its former position. The opening in the prepuce, when forcibly retracted beyond the coronal sulcus, becomes a constricting ring that cannot be reduced. The constricting ring created causes a tension greater than the lymphatic pressure and results in edema of the prepuce, the penile shaft, and the glans penis distal to the incarcerated foreskin.1,2As lymphatic drainage is impaired and tissue swelling increases, reduction of the foreskin becomes more difficult. Pain occurs as a result of swelling, and, eventually, as a result of vascular compromise. If. 相似文献
70.
Zusammenfassung
Operationsziel Schmerzfrei belastungsf?hige Fü?e.
Indikationen Gehen und Stehen schmerzhaft.
Unbefriedigende Einlagen- und Schuhversorgung.
Unbefriedigende ?sthetik.
Kontraindikationen Schlechte Hautverh?ltnisse.
Operationstechnik Dorsaler Zugang beiderseits.
Resektion von intermetatarsalen Knochenbrücken.
Korrekturosteotomien fehlstehender Mittelfu?knochen.
Beseitigung des Hallux varus durch Reposition der Gro?zehe im Grundgelenk und tempor?re Kirschner-Drahtfixation des Gro?zehenstrahls
und der Mittelfu?fragmente.
Ergebnisse Zw?lf Jahre nach den Eingriffen an beiden Fü?en lag ein ?sthetisch und funktionell sehr gutes Resultat vor. Die Patientin
trug normale Kaufschuhe und belastete beide Fü?e tadellos. Die Fü?e konnten allerdings wegen ausgedehnter angeborener Synostosen
der Fu?wurzel- und Tarsometatarsalgelenke nicht befriedigend abgerollt werden. 相似文献