全文获取类型
收费全文 | 15692篇 |
免费 | 980篇 |
国内免费 | 88篇 |
专业分类
耳鼻咽喉 | 161篇 |
儿科学 | 315篇 |
妇产科学 | 268篇 |
基础医学 | 2132篇 |
口腔科学 | 157篇 |
临床医学 | 1430篇 |
内科学 | 3745篇 |
皮肤病学 | 270篇 |
神经病学 | 1638篇 |
特种医学 | 723篇 |
外科学 | 2738篇 |
综合类 | 36篇 |
一般理论 | 2篇 |
预防医学 | 687篇 |
眼科学 | 139篇 |
药学 | 1074篇 |
中国医学 | 19篇 |
肿瘤学 | 1226篇 |
出版年
2024年 | 12篇 |
2023年 | 109篇 |
2022年 | 175篇 |
2021年 | 480篇 |
2020年 | 229篇 |
2019年 | 458篇 |
2018年 | 547篇 |
2017年 | 368篇 |
2016年 | 362篇 |
2015年 | 448篇 |
2014年 | 708篇 |
2013年 | 814篇 |
2012年 | 1304篇 |
2011年 | 1343篇 |
2010年 | 744篇 |
2009年 | 723篇 |
2008年 | 1084篇 |
2007年 | 1029篇 |
2006年 | 1049篇 |
2005年 | 918篇 |
2004年 | 886篇 |
2003年 | 723篇 |
2002年 | 702篇 |
2001年 | 146篇 |
2000年 | 107篇 |
1999年 | 140篇 |
1998年 | 134篇 |
1997年 | 114篇 |
1996年 | 87篇 |
1995年 | 82篇 |
1994年 | 73篇 |
1993年 | 48篇 |
1992年 | 66篇 |
1991年 | 45篇 |
1990年 | 50篇 |
1989年 | 52篇 |
1988年 | 59篇 |
1987年 | 42篇 |
1986年 | 40篇 |
1985年 | 30篇 |
1984年 | 21篇 |
1983年 | 24篇 |
1982年 | 16篇 |
1978年 | 15篇 |
1975年 | 15篇 |
1974年 | 14篇 |
1972年 | 13篇 |
1971年 | 14篇 |
1970年 | 20篇 |
1969年 | 16篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Prince Kevin Danieles Marina Ybarra Andraea Van Hulst Tracie A. Barnett Marie-Ève Mathieu Lisa Kakinami Olivier Drouin Jean-Luc Bigras Mélanie Henderson 《Obesity research & clinical practice》2021,15(2):157-162
IntroductionAttrition in pediatric weight management programs is notoriously high. Greater understanding of its determinants is needed to inform retention strategies. We identified determinants of attrition in CIRCUIT, a healthy lifestyle intervention program for youth at risk of cardiovascular disease.MethodsA one-arm intervention study of children aged 4-18 years who initiated the CIRCUIT program in the first five years of its existence (N = 403). We defined attrition as attending the baseline visit but ceasing attendance prior to the 1-year follow-up. Potential determinants of dropout included the child’s age, sex, ethnicity, body mass index (BMI) z-score, family socio-demographic characteristics, and estimated driving time to the program, all measured at baseline. Associations were estimated bivariately, using chi-squared- and t-tests, and simultaneously in a multivariable logistic regression model.ResultsOf the 403 participants who started the program, 198 (49%) dropped out within 12 months of enrollment. Youth who dropped out were older (mean age 12.8y vs. 11.3y; p < 0.01), were less likely to live with both parents (62% vs. 71%; p = 0.05), and to have mothers who had completed high school (79% vs. 88%; p = 0.01). No group differences were observed for sex, ethnicity, baseline BMI z-score, fathers’ education, or driving time to the program. In multivariate models, only older age at initiation of the intervention (OR: 1.2; CI: 1.1,1.3) and lower maternal education (OR: 2.0; CI: 1.0,3.8) were associated with dropout.ConclusionImproved tailoring of interventions to older pediatric participants and to families of lower maternal education may help reduce attrition in CIRCUIT and similar lifestyle intervention programs. 相似文献
92.
Juliana Chen Solne Bertrand Olivier Galy David Raubenheimer Margaret Allman-Farinelli Corinne Caillaud 《Nutrients》2021,13(5)
The food environment in New Caledonia is undergoing a transition, with movement away from traditional diets towards processed and discretionary foods and beverages. This study aimed to develop an up-to-date food composition database that could be used to analyze food and nutritional intake data of New Caledonian children and adults. Development of this database occurred in three phases: Phase 1, updating and expanding the number of food items to represent current food supply; Phase 2, refining the database items and naming and assigning portion size images for food items; Phase 3, ensuring comprehensive nutrient values for all foods, including saturated fat and total sugar. The final New Caledonian database comprised a total of 972 food items, with 40 associated food categories and 25 nutrient values and 615 items with portion size images. To improve the searchability of the database, the names of 593 food items were shortened and synonyms or alternate spelling were included for 462 foods. Once integrated into a mobile app-based multiple-pass 24-h recall tool, named iRecall.24, this country-specific food composition database would support the assessment of food and nutritional intakes of families in New Caledonia, in a cross-sectional and longitudinal manner, and with translational opportunities for use across the wider Pacific region. 相似文献
93.
Tim A. Kanters Jasper J. Brugts Olivier C. Manintveld Matthijs M. Versteegh 《Value in health》2021,24(2):236-243
ObjectivesPatients with atrial fibrillation (AF) have rapid and irregular heart rates, increasing the risk of comorbidities and mortality. Next to formal medical care, many patients receive informal care from their social environment. The objective of this study was to examine the well-being and economic burden of providing informal care to patients with AF in the UK, Italy, and Germany.MethodsCaregivers of patients with AF completed an online survey based on the iMTA Valuation of Informal Care Questionnaire, with questions about their caregiving situation, perceived burden of caregiving, and absence from work due to health problems resulting from caregiving. Care-related quality-of-life utilities were calculated using the Care-related Quality of Life instrument and associated tariffs. Societal costs of caregiving were calculated based on the proxy good method.ResultsA total of 585 caregivers participated in this study. On average, caregivers provided 33 hours of informal care per week to patients (SD 29 hours). On a scale from 0 to 10, their self-rated burden was 5.4. The average Care-related Quality of Life utility was 72. Caregivers primarily indicated problems with daily activities, mental health, and physical health. Still, the vast majority of caregivers (87%) derived fulfillment from providing care. Weekly societal costs of caregiving were on average €636. Comorbidities contributed substantially to the caregiver time and burden.ConclusionsCaring for a patient with AF is associated with substantial objective and subjective burden, but also provides fulfillment from being able to care for a loved one. 相似文献
94.
Nicolas Germain Anne-Sophie Hatzfeld Louise Pasquesoone Pierre- Marie Danze Pierre Guerreschi Boualem Sendid Olivier Gaillot Philippe Marchetti 《Burns : journal of the International Society for Burn Injuries》2021,47(2):387-396
BackgroundMicrobial contamination of human skin allografts is a frequent cause of allograft discard. Our purpose was to evaluate the discard rate of skin bank contaminated allografts and specific procedures used to reduce allograft contamination without affecting safety.MethodsWe conducted at the Lille Tissue Bank a retrospective study of all deceased donors (n = 104) harvested from January 2018 to December 2018. Skin procurement was split into 3 zones: the back of the body and the two legs that were processed separately. It represented 433 cryopreserved skin allograft pouches of approximatively 500 cm² each. Donors were almost equally split between brain-dead (53%, 55/104) and cadaveric (47%, 49/104) donors.ResultsOut of all donors, 42 (40.5%) had at least one sampling zone with a positive microbiological test resulting in 106 (24%) contaminated skin pouches. The contamination rate did not vary according to the harvested zone or type of donor. Traumatic deaths showed significantly less contamination rates than other death types (p < 0.05). Contamination rate decreased with time spent in the antibiotic solution. The risk of having contaminated allografts was five-fold higher when the skin spent less than 96 h in the antibiotic cocktail (p < 0.05). According to our validation protocol, most donors (32/42, 76%) had skin allografts contaminated with bacteria (mainly Staphylococcus spp) compatible with clinical use. No recipient infection was recorded as a result of skin graft contaminated with saprophytic or non-pathogenic germs. By harvesting 3 separate zones per donor, the total surface area for clinical use increased by 53% for contaminated donors. Overall, the proportion of contamination-related discarded allografts was 3.2% (14/433 of pouches).ConclusionFew simple pragmatic measures (including skin incubation in the antibiotic bath for at least 96 h at 4 °C, splitting the skin harvesting areas to minimize the risk of cross-infection and clinical use of allografts contaminated with saprophytic and non-pathogenic germs) can reduce the discard rate of contaminated allografts without affecting clinical safety. 相似文献
95.
Rodolphe Durieux Vincent Tchana‐Sato Jean‐Paul Lavigne Marc A. Radermecker Marie Moonen Irne Scagnol Christine Gennigens Jean‐Olivier Defraigne 《Journal of cardiac surgery》2021,36(1):357-362
Cardiac intimal sarcoma is extremely rare and aggressive primary malignant cardiac tumors. Here, we reported the case of a young man initially operated for a tumor of the left atrium, causing a dynamic obstruction of the mitral valve and (mis‐)diagnosed as a myxoma at the histopathological analysis. Patient presented a local recurrence at 3 months and was reoperated. Pathology revealed this time the presence of an intimal sarcoma. Patient received adjuvant chemotherapy. Despite a good local control, the 1‐year follow‐up positron emission tomography scan revealed the presence of a metastasis in the left adrenal gland that was surgically resected. This article aims to highlight the risk of misdiagnosis in case of cardiac tumors, the hypothetical concept of malignant transformation of a cardiac myxoma, the aggressive course of the extremely rare cardiac intimal sarcoma, and the therapeutic modalities available to treat this pathology. 相似文献
96.
Isabel M. A. Brüggenwirth Maureen J. M. Werner René Adam Wojciech G. Polak Vincent Karam Michael A. Heneghan Arianeb Mehrabi Jürgen L. Klempnauer Andreas Paul Darius F. Mirza Johann Pratschke Mauro Salizzoni Daniel Cherqui Michael Allison Olivier Soubrane Steven J. Staffa David Zurakowski Robert J. Porte Vincent E. de Meijer all the other contributing centers the European Liver Intestine Transplant Association 《Transplant international》2021,34(10):1928-1937
High-risk combinations of recipient and graft characteristics are poorly defined for liver retransplantation (reLT) in the current era. We aimed to develop a risk model for survival after reLT using data from the European Liver Transplantation Registry, followed by internal and external validation. From 2006 to 2016, 85 067 liver transplants were recorded, including 5581 reLTs (6.6%). The final model included seven predictors of graft survival: recipient age, model for end-stage liver disease score, indication for reLT, recipient hospitalization, time between primary liver transplantation and reLT, donor age, and cold ischemia time. By assigning points to each variable in proportion to their hazard ratio, a simplified risk score was created ranging 0–10. Low-risk (0–3), medium-risk (4–5), and high-risk (6–10) groups were identified with significantly different 5-year survival rates ranging 56.9% (95% CI 52.8–60.7%), 46.3% (95% CI 41.1–51.4%), and 32.1% (95% CI 23.5–41.0%), respectively (P < 0.001). External validation showed that the expected survival rates were closely aligned with the observed mortality probabilities. The Retransplantation Risk Score identifies high-risk combinations of recipient- and graft-related factors prognostic for long-term graft survival after reLT. This tool may serve as a guidance for clinical decision-making on liver acceptance for reLT. 相似文献
97.
98.
99.
Thomas Tabourin Judith Sarfati Ugo Pinar Nicolas Beaud Jerôme Parra Christophe Vaessen Florie Gomez Daniel Benamran Geoffroy Canlorbe Jérémie Belghiti Emmanuel Chartier-Kastler Olivier Cussenot Thomas Seisen Morgan Roupret 《Urologic oncology》2021,39(5):298.e7-298.e11
ObjectivesTo assess potential nosocomial coronavirus disease-2019 (COVID-19) transmission in patients who underwent robot-assisted laparoscopic procedures during the pandemic.Material and methodsProspective study in patients undergoing robot-assisted laparoscopy in urology or gynaecology within 2 academic hospitals. Patients underwent local preoperative COVID-19 screening using a symptoms questionnaire. Patients with suspicious screening underwent coronavirus real time-polymerase chain reaction (RT-PCR) and were excluded from robotic surgery if positive. Patients with symptoms postsurgery were systematically tested for coronavirus by RT-PCR. One-month postsurgery, all patients had a telephone consultation to evaluate COVID-19 symptoms.ResultsSixty-eight patients underwent robotic surgery during the study period (median age: 63-years [IQR: 53–70], 1.8 male: female ratio). Oncology was the main indication for robotic surgery (n = 62, 91.2%) and 26 patients (38.2%) received a chest CT-scan prior to surgery. Eleven patients (16.2%) were symptomatic after surgery of whom only 1 tested positive for coronavirus by RT-PCR (1.5%) and was transferred to COVID-19 unit with no life-threatening condition. No attending surgeon was diagnosed with COVID-19 during the study.ConclusionsRobot-assisted laparoscopic surgery seemed safe in the era of COVID-19 as long as all recommended precautions are followed. The rate of nosocomial COVID-19 transmission was extremely low despite the fact that we only used RT-PCR testing in symptomatic patients during the preoperative work-up. Larger cohort is needed to validate these results. 相似文献
100.