全文获取类型
收费全文 | 11353篇 |
免费 | 672篇 |
国内免费 | 83篇 |
专业分类
耳鼻咽喉 | 85篇 |
儿科学 | 210篇 |
妇产科学 | 155篇 |
基础医学 | 1386篇 |
口腔科学 | 206篇 |
临床医学 | 1110篇 |
内科学 | 3152篇 |
皮肤病学 | 126篇 |
神经病学 | 910篇 |
特种医学 | 384篇 |
外科学 | 1846篇 |
综合类 | 58篇 |
一般理论 | 1篇 |
预防医学 | 779篇 |
眼科学 | 111篇 |
药学 | 693篇 |
中国医学 | 15篇 |
肿瘤学 | 881篇 |
出版年
2024年 | 10篇 |
2023年 | 83篇 |
2022年 | 151篇 |
2021年 | 375篇 |
2020年 | 190篇 |
2019年 | 374篇 |
2018年 | 473篇 |
2017年 | 293篇 |
2016年 | 289篇 |
2015年 | 359篇 |
2014年 | 502篇 |
2013年 | 617篇 |
2012年 | 976篇 |
2011年 | 989篇 |
2010年 | 540篇 |
2009年 | 447篇 |
2008年 | 715篇 |
2007年 | 764篇 |
2006年 | 641篇 |
2005年 | 685篇 |
2004年 | 636篇 |
2003年 | 547篇 |
2002年 | 553篇 |
2001年 | 105篇 |
2000年 | 85篇 |
1999年 | 98篇 |
1998年 | 98篇 |
1997年 | 56篇 |
1996年 | 54篇 |
1995年 | 50篇 |
1994年 | 38篇 |
1993年 | 39篇 |
1992年 | 39篇 |
1991年 | 38篇 |
1990年 | 14篇 |
1989年 | 16篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 16篇 |
1985年 | 14篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1981年 | 7篇 |
1979年 | 9篇 |
1974年 | 6篇 |
1972年 | 7篇 |
1970年 | 14篇 |
1969年 | 12篇 |
1967年 | 9篇 |
1966年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Magne Aldrin Ragnhild Raastad Ingunn Fride Tvete Dag Berild Arnoldo Frigessi Truls Leegaard Dominique L. Monnet Mette Walberg Fredrik Müller 《Statistics in medicine》2013,32(8):1407-1418
Association between previous antibiotic use and emergence of antibiotic resistance has been reported for several microorganisms. The relationship has been extensively studied, and although the causes of antibiotic resistance are multi‐factorial, clear evidence of antibiotic use as a major risk factor exists. Most studies are carried out in countries with high consumption of antibiotics and corresponding high levels of antibiotic resistance, and currently, little is known whether and at what level the associations are detectable in a low antibiotic consumption environment. We conduct an ecological, retrospective study aimed at determining the impact of antibiotic consumption on antibiotic‐resistant Pseudomonas aeruginosa in three hospitals in Norway, a country with low levels of antibiotic use. We construct a sophisticated statistical model to capture such low signals. To reduce noise, we conduct our study at hospital ward level. We propose a random effect Poisson or binomial regression model, with a reparametrisation that allows us to reduce the number of parameters. Inference is likelihood based. Through scenario simulation, we study the potential effects of reduced or increased antibiotic use. Results clearly indicate that the effects of consumption on resistance are present under conditions with relatively low use of antibiotic agents. This strengthens the recommendation on prudent use of antibiotics, even when consumption is relatively low. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
72.
Evelina Chapman Ludovic Reveiz Amy Chambliss Stephanie Sangalang Xavier Bonfill 《Journal of clinical epidemiology》2013,66(1):105-112
ObjectivesTo use an “evidence-mapping” approach to assess the usefulness of Cochrane reviews in identifying research gaps in the maternal health.Study Design and SettingThe article describes the general mapping, prioritizing, reconciling, and updating approach: (1) identifying gaps in the maternal health research using published systematic reviews and formulating research questions, (2) prioritizing questions using Delphi method, (3) reconciling identified research priorities with the existing literature (i.e., searching of ongoing trials in trials registries), (4) updating the process. A comprehensive search of Cochrane systematic reviews published or updated from January 2006 to March 2011 was performed. We evaluated the “Implications for Research” section to identify gaps in the research.ResultsOur search strategy identified 695 references; 178 systematic reviews identifying at least one research gap were used. We formulated 319 research questions, which were classified into 11 different categories based on the direct and indirect causes of maternal mortality: postpartum hemorrhage, abortion, hypertensive disorders, infection/sepsis, caesarean section, diabetes, pregnancy prevention, preterm labor, other direct causes, indirect causes, and health policies and systems. Most research questions concerned the effectiveness of clinical interventions, including drugs (42.6%), nonpharmacologic interventions (16.3%), and health system (14.7%).ConclusionIt is possible to identify gaps in the maternal health research by using this approach. 相似文献
73.
David E. Barroso Terezinha M.P.P. Casti?eiras Fernanda S. Freitas Jane W. Marsh Mary G. Krauland Mary M. Tulenko érica L. Fonseca Ana C.P. Vicente Maria C. Rebelo Elaine O. Cerqueira Adriano C. Xavier Ana P.C.M. Cardozo Simone E.M. da Silva Lee H. Harrison 《Emerging infectious diseases》2013,19(11):1847-1850
During 2003–2012, 8 clusters of meningococcal disease were identified in Rio de Janeiro State, Brazil, all caused by serogroup C Neisseria meningitidis. The isolates were assigned to 3 clonal complexes (cc): cc11, cc32, and cc103. These hyperinvasive disease lineages were associated with endemic disease, outbreaks, and high case-fatality rates. 相似文献
74.
75.
76.
Escarlata Angullo-Martínez Enrique Carretero-Anibarro Ignacio Manuel Snchez Barrancos Xavier Cos Claramunt Domingo Orozco Beltrn Jos Luis Torres Baile Patxi Ezkurra Loiola en representacin del Grupo de Trabajo de Diabetes de la SemFyC en representacin del Grupo de Trabajo de Diabetes de la SemFyC 《Atencion primaria / Sociedad Espa?ola de Medicina de Familia y Comunitaria》2021,53(4)
Las circunstancias actuales provocadas por la COVID-19 nos obligan a los profesionales de atención primaria a idear nuevas formas de garantizar la atención sanitaria de nuestros pacientes con diabetes tipo 2 (DM2). Existen evidencias que respaldan la eficacia de la telemedicina en el control glucémico de los pacientes con DM2. Ante la rápida adaptación de la práctica clínica al uso de la telemedicina, el Grupo de Trabajo de Diabetes de la Sociedad Española de Medicina Familiar y Comunitaria (SemFyC) optó por elaborar un documento de consenso plasmado en un algoritmo de actuación/seguimiento telemático en la atención de los pacientes con DM2.Palabras clave: Telemedicina, Diabetes mellitus tipo 2, COVID-19 相似文献
77.
78.
79.
Dr. Xavier Hébuterne MD Patrick Hastier MD Jean-Luc Péroux MD Nabil Zeboudj MD Jean-Pierre Delmont MD Patrick Rampal MD 《Digestive diseases and sciences》1996,41(3):533-539
The aim of this study was to assess resting energy expenditure in patients with chronic pancreatitis; 33 patients with alcohol-related chronic pancreatitis (group 1: 13 normal weight, group 2: 20 underweight) and 11 undernourished patients without identifiable disease (group 3) were studied. Body composition was determined by bioelectric impedance analysis and energy expenditure by indirect calorimetry. The percentage of body weight occupied by fat-free mass was similar among the three groups (76.4±1.5%, 78.6±1.3% and 76.8±2.1% for groups 1, 2, and 3, respectively). The measured resting energy expenditure (REE) was higher than the predicted EE (Harris and Benedict formula and Cunningham's equation) for the underweight patients with chronic pancreatitis (group 2) (P<0.05), but not for the two other groups. According to Cunningham's equation, 65% of the group 2 patients were hypermetabolic (REE>110% of predicted EE) versus 23.1% and 20% in groups 1 and 3. When adjusted for fat free mass, REE was significantly (P<0.01) higher in group 2 (35.0±0.9 kcal/kg/24 hr) than in the other two groups (30.1±0.7 kcal/kg/24 hr and 30.8±1.4 kcal/kg/24 hr in groups 1 and 3, respectively). During chronic pancreatitis, weight loss is accompanied by hypermetabolism, which should be taken into consideration during nutritional support. 相似文献
80.