全文获取类型
收费全文 | 1368919篇 |
免费 | 98805篇 |
国内免费 | 2980篇 |
专业分类
耳鼻咽喉 | 19994篇 |
儿科学 | 41797篇 |
妇产科学 | 39747篇 |
基础医学 | 191829篇 |
口腔科学 | 40201篇 |
临床医学 | 116908篇 |
内科学 | 268644篇 |
皮肤病学 | 30829篇 |
神经病学 | 110448篇 |
特种医学 | 54327篇 |
外国民族医学 | 435篇 |
外科学 | 211585篇 |
综合类 | 31363篇 |
现状与发展 | 6篇 |
一般理论 | 510篇 |
预防医学 | 96905篇 |
眼科学 | 31904篇 |
药学 | 102302篇 |
4篇 | |
中国医学 | 3020篇 |
肿瘤学 | 77946篇 |
出版年
2018年 | 13440篇 |
2016年 | 11884篇 |
2015年 | 13229篇 |
2014年 | 18467篇 |
2013年 | 27482篇 |
2012年 | 36187篇 |
2011年 | 38006篇 |
2010年 | 22317篇 |
2009年 | 21578篇 |
2008年 | 35636篇 |
2007年 | 38817篇 |
2006年 | 39057篇 |
2005年 | 37661篇 |
2004年 | 36502篇 |
2003年 | 35223篇 |
2002年 | 34645篇 |
2001年 | 63760篇 |
2000年 | 65431篇 |
1999年 | 55547篇 |
1998年 | 14877篇 |
1997年 | 13590篇 |
1996年 | 13043篇 |
1995年 | 12332篇 |
1994年 | 11561篇 |
1992年 | 42814篇 |
1991年 | 41331篇 |
1990年 | 40590篇 |
1989年 | 39581篇 |
1988年 | 36993篇 |
1987年 | 36427篇 |
1986年 | 34930篇 |
1985年 | 33132篇 |
1984年 | 24853篇 |
1983年 | 21079篇 |
1982年 | 12690篇 |
1981年 | 11594篇 |
1979年 | 23943篇 |
1978年 | 17087篇 |
1977年 | 14843篇 |
1976年 | 13393篇 |
1975年 | 15275篇 |
1974年 | 18088篇 |
1973年 | 17565篇 |
1972年 | 16821篇 |
1971年 | 15726篇 |
1970年 | 14920篇 |
1969年 | 14348篇 |
1968年 | 13461篇 |
1967年 | 12019篇 |
1966年 | 11260篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
Sarah Hallas Andrea Nelson Susan O'Meara Una Adderley Pauline Meskell Jane Nixon Aonghus O'Loughlin Sebastian Probst Wael Tawfick Thomas Wild Georgina Gethin 《Journal of tissue viability》2021,30(3):317-323
BackgroundA venous leg ulcer is a chronic leg wound caused by poor venous blood circulation in the lower limbs. It is a recurring condition causing pain, malodour, reduced mobility, and depression. Randomised controlled trials evaluating treatments for venous leg ulcers provide important evidence to inform clinical decision-making. However, for findings to be useful, outcomes need to be clinically meaningful, consistently reported across trials, and fully reported. Research has identified the large number of outcomes reported in venous leg ulcer trials, impacting both synthesis of results, and clinical decision-making. To address this, a core outcome set will be developed. A core outcome set is an agreed standardised set of outcomes which should be, as a minimum, measured and reported in all trials which evaluate treatment effectiveness for a given indication. A core outcome set has the potential to reduce research waste, improve the utility of RCTs, reduce reporting bias, facilitate treatment comparisons across different sources of evidence and expedite the production of systematic reviews, meta-analyses and evidence-based clinical guidelines.AimThe aim of this project is to develop a core outcome set for research evaluating the effectiveness of interventions for treating venous leg ulceration.MethodsThrough a scoping review of the literature on venous leg ulceration, we will firstly identify a list of candidate outcome domains (broad categories in relation to what is being measured) from randomised controlled trials and qualitative research, and outcomes (specific methods in relation to what is being measured). In two further stages, we will use the resulting lists of outcome domains and outcomes to design two online surveys. A range of stakeholders will be invited to participate in the surveys and they will be asked to indicate which outcome domains and outcomes are most important and should be considered as core in future research reports. 相似文献
93.
94.
95.
Laura Heil Laura Maltry Sebastian Lehmann Daniel Heil Christoph Lehmann Stefan Kopp 《Cranio : the journal of craniomandibular practice》2021,39(1):35-46
ABSTRACT Objective: The purpose of this study was to examine the influence of a total knee arthroplasty (TKA) on linked cranial and caudal structures. Methods: Thirty-five (14f/21m) subjects participated in this study: 15 subjects (9f, 6m) pre- and post- TKA and a control group of 20 subjects (5f, 15m). The measurements included: jaw condyle position and movement, back scan, plantar pressure distribution, and body sway. Results: There were no significant differences in electronic position analysis of the jaw; however, the protrusion of the TKA group improved (p = 0.001). The test group had a more anteriorly inclined thoracic spine and a less pronounced lumbar lordosis. Before and after surgery, the body sway in the test group was larger. Conclusion: The TKA affected most prominently the static mechanisms of the postural control and the spine position. The trajectories of the mandible during protrusion also changed slightly. 相似文献
96.
M.A. Mashrah T.A. Aldhohrah A. Abdelrehem Moustafa H.M. Al-Sharani A. Alrmali L. Wang 《International journal of oral and maxillofacial surgery》2021,50(1):21-31
Donor site morbidity following radial forearm flap (RFF) harvest remains a controversial issue. The aim of this meta-analysis was to answer the question “Are the range of wrist movements (range of motion, ROM) and hand strength affected after RFF harvesting?” The PubMed, Embase, Scopus, and Cochrane Library electronic databases were systematically searched (to December 2019). Self-controlled studies evaluating hand biomechanics after RFF harvest were included. Weighted mean differences with 95% confidence intervals were calculated using the random-effects model. The outcome variables were ROM, forearm movements, grip, and pinch strengths. Thirteen studies involving a total of 335 patients were included. With the exception of grip strength and supination, which showed statistically significant reductions of about 2.40 kg and 2.86° (P < 0.05), all other ROM, forearm movements, and pinch strengths showed an insignificant difference when the operated hand was compared to the non-operated hand (P > 0.05). Regression analysis showed that the method of donor site closure and size of the donor site defect had an insignificant impact on hand biomechanics. This study confirms the lack of discernible biomechanical morbidity after RFF transfer. The minimal reduction in hand biomechanics after RFF is considered to be clinically negligible. 相似文献
97.
Sarah Averbach Othman Kakaire Rachel McDiehl Christine Dehlendorf Felicia Lester Jody Steinauer 《Contraception》2019,99(2):87-93
Objective
This study assessed whether immediate postpartum insertion of levonorgestrel contraceptive implants is associated with a difference in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 and 6 months postpartum compared to delayed insertion at 6 to 8 weeks postpartum.Study design
We conducted a randomized trial of women in Uganda who desired contraceptive implants postpartum. We randomly assigned participants to receive either immediate (within 5 days of delivery) or delayed (6 to 8 weeks postpartum) insertion of a two-rod levonorgestrel contraceptive implant system. This is a prespecified secondary analysis evaluating breastfeeding outcomes. The primary outcome of this secondary analysis was change in infant weight; infants were weighed and measured at birth and 6 months. We used a validated questionnaire to assess onset of lactogenesis daily in person while participants were in the hospital, and then daily by phone after they left the hospital, until lactogenesis was documented. We used interviewer-administered questionnaires to assess breastfeeding continuation and concerns at 3 months and 6 months postpartum.Results
Among the 96 women randomized to the immediate group and the 87 women to the delayed group, the mean change in infant weight from birth to 6 months was similar between groups: 4632?g in the immediate group and 4407?g in the delayed group (p=.26). Among the 97 women who had not experienced lactogenesis prior to randomization, the median time to onset of lactogenesis did not differ significantly between the immediate and delayed groups (65?h versus 63?h; p=.84). Similar proportions of women in the immediate and delayed groups reported exclusive breastfeeding at 3 months (74% versus 71%; p=.74) and 6 months (48% versus 52%; p=.58).Conclusion
We found no association between the timing of postpartum initiation of levonorgestrel contraceptive implants and change in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 or 6 months postpartum.Implications
This study provides evidence that immediate postpartum initiation of contraception implants does not have a deleterious effect on infant growth or initiation or continuation of breastfeeding. 相似文献98.
99.
100.