全文获取类型
收费全文 | 6237篇 |
免费 | 407篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 54篇 |
儿科学 | 113篇 |
妇产科学 | 94篇 |
基础医学 | 602篇 |
口腔科学 | 117篇 |
临床医学 | 675篇 |
内科学 | 1303篇 |
皮肤病学 | 51篇 |
神经病学 | 480篇 |
特种医学 | 533篇 |
外科学 | 985篇 |
综合类 | 104篇 |
一般理论 | 2篇 |
预防医学 | 652篇 |
眼科学 | 81篇 |
药学 | 362篇 |
1篇 | |
中国医学 | 3篇 |
肿瘤学 | 460篇 |
出版年
2022年 | 40篇 |
2021年 | 83篇 |
2020年 | 53篇 |
2019年 | 81篇 |
2018年 | 114篇 |
2017年 | 72篇 |
2016年 | 76篇 |
2015年 | 101篇 |
2014年 | 137篇 |
2013年 | 202篇 |
2012年 | 353篇 |
2011年 | 324篇 |
2010年 | 173篇 |
2009年 | 163篇 |
2008年 | 274篇 |
2007年 | 307篇 |
2006年 | 279篇 |
2005年 | 268篇 |
2004年 | 280篇 |
2003年 | 209篇 |
2002年 | 199篇 |
2001年 | 180篇 |
2000年 | 194篇 |
1999年 | 164篇 |
1998年 | 75篇 |
1997年 | 53篇 |
1996年 | 57篇 |
1995年 | 50篇 |
1994年 | 51篇 |
1993年 | 54篇 |
1992年 | 154篇 |
1991年 | 135篇 |
1990年 | 167篇 |
1989年 | 158篇 |
1988年 | 145篇 |
1987年 | 136篇 |
1986年 | 128篇 |
1985年 | 100篇 |
1984年 | 91篇 |
1983年 | 72篇 |
1982年 | 42篇 |
1979年 | 54篇 |
1978年 | 59篇 |
1977年 | 38篇 |
1976年 | 42篇 |
1974年 | 52篇 |
1973年 | 46篇 |
1972年 | 44篇 |
1970年 | 38篇 |
1969年 | 38篇 |
排序方式: 共有6672条查询结果,搜索用时 46 毫秒
91.
PURPOSE: To evaluate the long-term effect of vitrectomy with or without arteriovenous sheathotomy for macular edema secondary to branch retinal vein occlusion (BRVO). METHODS: The study was a prospective, randomized, comparative, interventional case series of 36 patients (36 eyes) who underwent pars plana vitrectomy with or without arteriovenous sheathotomy for macular edema due to BRVO of 相似文献
92.
93.
Prognostic implications of morphology and karyotype in primary myelodysplastic syndromes 总被引:2,自引:1,他引:2
Forty-nine patients with primary myelodysplastic syndromes (MDS) were subclassified according to French-American-British (FAB) Cooperative Group criteria. Eight patients had acquired idiopathic sideroblastic anemia (AISA), ten had chronic myelomonocytic leukemia (CMMoL), 14 had refractory anemia (RA), nine had refractory anemia with excess blasts (RAEB), and five had refractory anemia with excess blasts in transformation (RAEB-T); three patients could not be subclassified. The actuarial median survival for patients with AISA or with RA had not been reached at 60 months of follow-up. The median survival times for patients with CMMoL, RAEB, and RAEB-T were 25, 21, and 16 months, respectively. The percentages of patients with each subtype who developed ANLL were none in AISA, 20% in CMMoL, 7% in RA, 56% in RAEB, and 40% in RAEB-T. Patients with CMMoL had a poor prognosis independent of transformation to acute nonlymphocytic leukemia (ANLL), whereas patients with RAEB and RAEB-T had a high incidence of transformation and short survival times. Clonal chromosomal abnormalities were present in bone marrow cells from 19 patients at the time of diagnosis, and two others developed an abnormal karyotype at the time of leukemic transformation. The most frequent abnormalities, including initial and evolutionary changes, were trisomy 8 (9 patients), deletion of 5q (4 patients), and deletion of 20q (4 patients). The median survival times were 32 months for patients with an abnormal karyotype, and 48 months for those with a normal karyotype (P = 0.2). Specific chromosomal abnormalities were not associated with particular histologic subtypes; however, a high percentage of patients with RAEB and RAEB-T had an abnormal clone (89% and 80%, respectively). The percentages of patients with clonal abnormalities were 13% for AISA, 20% for CMMoL, and 29% for RA. The MDS transformed to ANLL in 42% of patients with an abnormal karyotype, compared to 10% of those with an initially normal karyotype (P less than .01). Among patients with RA, RAEB, and RAEB-T, the risk of leukemic transformation was confined to those with an abnormal karyotype (P less than .01). Thus, in the present study, morphology and karyotype combined were the best indicators of outcome in patients with MDS. 相似文献
94.
95.
96.
Jennifer M. Logue Elisa Zucchetti Christina A. Bachmeier Gabriel S. Krivenko Victoria Larson Daniel Ninh Giovanni Grillo Biwei Cao Jongphil Kim Julio C. Chavez Aliyah Baluch Farhad Khimani Aleksandr Lazaryan Taiga Nishihori Hien D. Liu Javier Pinilla-Ibarz Bijal D. Shah Rawan Faramand Anna E. Coghill Marco L. Davila Bhagirathbhai R. Dholaria Michael D. Jain Frederick L. Locke 《Haematologica》2021,106(4):978
CD19 chimeric antigen receptor T (CAR T)-cell therapy with axicabtagene ciloleucel (axi-cel) for relapsed or refractory (R/R) large B-cell lymphoma (LBCL) may lead to durable remissions, however, prolonged cytopenias and infections may occur. In this single center retrospective study of 85 patients, we characterized immune reconstitution and infections for patients remaining in remission after axi-cel for LBCL. Prolonged cytopenias (those occurring at or after day 30 following infusion) were common with ≥grade 3 neutropenia seen in 21 of 70 (30%) patients at day 30 and persisting in 3 of 31 (9.7%) patients at 1 year. B cells were undetectable in 30 of 34 (88.2%) patients at day 30, but were detected in 11 of 19 (57.9%) at 1 year. Median immunoglobulin G levels levels reached a nadir at day 180. By contrast, CD4 T cells decreased from baseline and were persistently low with a median CD4 count of 155 cells/mL at 1 year after axi-cel (n=19, range: 33– 269). In total, 23 of 85 (27.1%) patients received intravenous immunoglobulins after axi-cel, and 34 of 85 (40%) received granulocyte-colony stimulating factor. Infections in the first 30 days occurred in 31 of 85 (36.5%) patients, of which 11 of 85 (12.9%) required intravenous antibiotics or hospitalization (“severe”) and were associated with cytokine release syndrome, neurotoxicity, tocilizumab use, corticosteroid use, and bridging therapy on univariate analyses. After day 30, seven severe infections occurred, with no late deaths due to infection. Prolonged cytopenias are common following axi-cel therapy for LBCL and typically recover with time. Most patients experience profound and prolonged CD4 T-cell immunosuppression without severe infection. 相似文献
97.
P V Rabins B W Rovner D B Larson B J Burns C Prescott R S Beardsley 《Journal of the American Geriatrics Society》1987,35(5):431-434
To examine the quality of mental health research in nursing homes, 130 articles published in six geriatric specialty and health care delivery journals were reviewed. Thirty-nine (30%) articles used a mental health measure. Measures of cognitive function were most common, being used in 32 (25%) of the articles reviewed. Twenty-three (18%) studies measured abnormal mental experiences and 17 (13%) articles measured behavioral disorder. Many articles used measures or determinations with no established reliability. Twenty-six of the articles which used a mental health measure also used a measure of activities of daily living or physical function. Retrospective and prospective studies were similar in number. A minority of articles used control groups, random samples, or prepost measures while a majority (64%) identified an outcome measure. We conclude that nursing home research can be improved by the increased use of reliable measures of cognition and abnormal mental experiences and by the development of reliable measures of behavioral disorder. Study design can be improved by identifying a priori hypotheses and by the increased use of random sampling and control/comparison groups. 相似文献
98.
I D Goldstrom B J Burns L G Kessler M A Feuerberg D B Larson N E Miller W J Cromer 《Journal of gerontology》1987,42(2):147-153
This study examined the use of general health, mental health, and other medical specialty services by elderly persons 65 and older with mental disorders and compares them with adults 45 to 64 and 18 to 44. Data were collected at the Bunker Hill Health Center (BHHC), a Boston neighborhood health center providing a broad range of ambulatory medical and specialty mental health services. Results show that the 5-year rate of mental disorder diagnoses for elderly individuals is not significantly different from persons 45 to 64, although it is higher than the rate for young adults 18 to 44. Not only were elderly adults less likely to see a mental health specialist, but when they did, their use of mental health specialty services was usually lower. 相似文献
99.
G. Browman H. Preisler A. Raza K. Syracuse N. Azarnia A. Benger P. Chervenick P. D''Arrigo T. Doeblin J. Goldberg A. Gottlieb H. Grunwald J. Kirshner R. Larson R. Meyer K. Miller R. Priore M. Stein W. R. Vogler I. Walker W. E. C. Wilson M. Barcos 《British journal of haematology》1989,71(4):493-497
Patients with acute myeloid leukaemia who fail to show substantial bone marrow cytoreduction by day 6 of induction therapy enter complete remission (CR) less frequently than patients with good bone marrow leukaemic cytoreduction. The objective of the current study was to determine whether an increase in the intensity of therapy on days 8, 9 and 10 ('augmentation' of remission induction therapy) for patients with poor bone marrow cytoreduction detected in the day 6 bone marrow could improve the complete remission rate without increasing the number of toxic deaths. Patients from six centres were entered and treated with standard dose ara-C for 7 or 10 d and an anthracycline for the first 3 d. Patients aged less than 60 years and with greater than 30% bone marrow biopsy cellularity or greater than 10% abnormal cells on the aspirate obtained 6 d after the start of therapy were augmented with cytosine arabinoside 3 g/m2 every 12 h on days 8, 9 and 10. Therapy was augmented in 116 of the 252 patients less than 60 years. There was a highly statistically significant difference between augmented and nonaugmented patients (P less than 0.001) for the per cent biopsy cellularity and per cent abnormal cells in the day 6 marrow. The CR rate for augmented patients was 69% and for nonaugmented patients 60% suggesting that augmentation therapy abrogated the prognostic significance of more extensive residual leukaemia in the day 6 bone marrow. The results suggest that augmentation of remission induction for patients with poor bone marrow cytoreduction detected 6 d after initiation of therapy, may salvage patients who are destined to fail remission induction because of resistant disease without producing excessive toxicity. 相似文献
100.
Feagan BG Vreeland MG Larson LR Bala MV 《The American journal of gastroenterology》2000,95(8):1955-1960
OBJECTIVE: The aim of this study was to estimate the annual cost of care of patients with Crohn's disease according to treatment setting. METHODS: Using a 1994 integrated claims database, patients with a Crohn's-related medical claim (ICD-9 code 555) from 10/01/94 to 09/30/95 were included in this analysis. These patients were stratified into three mutually exclusive disease severity groups: group 1, required hospitalization for Crohn's; group 2, required chronic glucocorticoid or immunosuppressive drug therapy for >6 months; group 3, all remaining patients. Direct charges (based on reimbursement) and utilization of resources were reported for each group. RESULTS: Six-hundred-seven patients were analyzed: 117(19%) in group 1, 31(5%) in group 2, and 459(76%) in group 3. Average age of all patients was 48 years and 43% of these patients were men. Average annual charges for all patients totaled $12,417. Group I patients experienced the highest mean charges ($37,135), whereas patients in groups 2 and 3 incurred $10,033 and $6,277. Approximately 25% of patients accounted for 80% of the total charges. CONCLUSIONS: Crohn's disease is associated with high cost. Although a minority of Crohn's patients required hospitalization, they tended to have higher utilization and were responsible for a majority of total expenditures. New therapies have the potential to reduce overall cost of care, if they prevent Crohn's-related hospitalizations. 相似文献