全文获取类型
收费全文 | 2793655篇 |
免费 | 189052篇 |
国内免费 | 7613篇 |
专业分类
耳鼻咽喉 | 35768篇 |
儿科学 | 92729篇 |
妇产科学 | 75473篇 |
基础医学 | 385949篇 |
口腔科学 | 72023篇 |
临床医学 | 251451篇 |
内科学 | 551835篇 |
皮肤病学 | 63657篇 |
神经病学 | 231594篇 |
特种医学 | 109645篇 |
外国民族医学 | 737篇 |
外科学 | 419386篇 |
综合类 | 53768篇 |
现状与发展 | 5篇 |
一般理论 | 1009篇 |
预防医学 | 217574篇 |
眼科学 | 59975篇 |
药学 | 199948篇 |
9篇 | |
中国医学 | 6023篇 |
肿瘤学 | 161762篇 |
出版年
2021年 | 20602篇 |
2019年 | 21342篇 |
2018年 | 50109篇 |
2017年 | 39012篇 |
2016年 | 45461篇 |
2015年 | 31123篇 |
2014年 | 42072篇 |
2013年 | 62493篇 |
2012年 | 88523篇 |
2011年 | 105808篇 |
2010年 | 69036篇 |
2009年 | 60888篇 |
2008年 | 99353篇 |
2007年 | 107137篇 |
2006年 | 87966篇 |
2005年 | 85965篇 |
2004年 | 84297篇 |
2003年 | 82808篇 |
2002年 | 78028篇 |
2001年 | 129634篇 |
2000年 | 132680篇 |
1999年 | 111569篇 |
1998年 | 31977篇 |
1997年 | 28539篇 |
1996年 | 28694篇 |
1995年 | 27887篇 |
1994年 | 25543篇 |
1993年 | 23883篇 |
1992年 | 85964篇 |
1991年 | 82354篇 |
1990年 | 79562篇 |
1989年 | 76755篇 |
1988年 | 70115篇 |
1987年 | 68700篇 |
1986年 | 64244篇 |
1985年 | 61167篇 |
1984年 | 45443篇 |
1983年 | 38419篇 |
1982年 | 22827篇 |
1981年 | 20241篇 |
1979年 | 39405篇 |
1978年 | 27824篇 |
1977年 | 23525篇 |
1976年 | 21797篇 |
1975年 | 23038篇 |
1974年 | 27110篇 |
1973年 | 25635篇 |
1972年 | 24037篇 |
1971年 | 22219篇 |
1970年 | 20437篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
171.
Chumakov E. M. Petrova N. N. Limankin O. V. Ashenbrenner Yu. V. 《Neuroscience and behavioral physiology》2022,52(1):45-51
Neuroscience and Behavioral Physiology - Objective. To determine the frequency, structure, and severity of cognitive impairments in patients with bipolar affective disorder (BAD) in remission.... 相似文献
172.
173.
Pavan Brahmamdam Stephen L. Carveth Mary Smyth Brian S. Gendelman M. Jeffrey Maisels 《Journal of pediatric surgery》2019,54(9):1800-1803
PurposeTo examine what proportion of caregivers, if given a choice, would choose medical versus surgical treatment of appendicitis and what factors would be important in their decision.MethodsA survey was devised and given to the caregivers of children presenting to the pediatrician for a routine visit in community and academic pediatric clinics. The survey presented a summary of outcomes after medical (non-operative) and surgical treatment of uncomplicated appendicitis. Participants were then asked to choose medical versus surgical treatment if their child were to develop appendicitis. They were also asked to rate the importance of certain factors in their decision ? 1 being “not important” and 5 being “very important”.ResultsFour hundred surveys were distributed with an 86.2% (345/400) response rate. Six percent (21/342) of respondents reported a history of appendicitis and 49.4% (168/340) reported having known someone who had appendicitis. The majority of respondents, 85.3% (284/333), were mothers. A minority of respondents, 41.7% (95% CI: 36.7, 47.0), chose medical treatment over surgery for appendicitis. There was no statistical difference in the proportion of mothers (41.6%) versus fathers who chose medical treatment (41.3%). Caregivers who chose medical treatment were more likely to rate time in hospital (p = .008) and time out of school (p = 05) as important in decision making when compared with those who chose surgery. Those who chose surgical treatment were more likely to rate risk of recurrent appendicitis (p < .001) as important to decision making. In the multivariate analysis, those who rated time in hospital as very important had more than twice the odds of choosing medical therapy (OR 2.20, p = 0.02) when compared with those who rated it as less important. Not knowing someone who has had appendicitis was significantly associated with choosing medical therapy when compared with those who do know someone who has had appendicitis, OR 2.3, p = .002. Rating pain as very important was also significantly associated with choosing medical therapy, when compared to those rating pain 1–3, OR 3.38, p = .03.ConclusionsIn this survey of caregivers of children presenting for routine care, 41.7% would choose medical, or non-operative, therapy for their children with acute appendicitis. The risk of recurrence, time in hospital, and time out of school, pain, and knowing someone who has had appendicitis were all important factors that families may consider when making a decision. These data may be useful for surgeons counseling patients on which treatment to pursue. 相似文献
174.
175.
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
176.
T.-Y. Huang Y.-J. Hsia M.-Y. Sung Y.-T. Wu P.-C. Hsu 《International journal of oral and maxillofacial surgery》2021,50(8):1100-1106
Zygomatic implant treatment is widely applied for severe maxillary atrophy to help rehabilitate the maxillary dentition. This retrospective study was performed to evaluate the actual radiographic bone–implant contact (rBIC) lengths of zygomatic implants. The records of 28 patients who underwent zygomatic implant surgery and subsequent follow-up examinations between August 2013 and September 2018 in the Department of Oral and Maxillofacial Surgery, Taipei Tzu Chi Hospital were reviewed. The surgeries were performed by a single surgeon using the same treatment protocol. All patients had a computed tomography scan at 1 year after the surgery. Using three-dimensional imaging software, an investigator measured the rBIC lengths of 66 implants and documented their clinical status. The implant survival rate was 100%. The mean rBIC length was significantly longer in male patients than in female patients (20.80 ± 5.88 mm versus 17.79 ± 6.34 mm; P = 0.028). The mean rBIC length of double zygomatic implants was significantly longer when compared to that of single implants (21.11 ± 6.23 mm versus 17.75 ± 5.85 mm; P = 0.027). This article is novel in reporting the exact rBIC lengths of zygomatic implants in a clinical setting. The results showed that zygomatic implants are a viable treatment modality for full-mouth rehabilitation. 相似文献
177.
178.
Willy Baccaglini Felipe A. Glina Cristiano Linck Pazeto Luis G. Medina Fernando Korkes Wanderley M. Bernardo Rene Sotelo Sidney Glina Giancarlo Marra Marco Moschini Xavier Cathelineau Rafael Sanchez-Salas 《Clinical genitourinary cancer》2021,19(1):3-11.e1
This meta-analysis focuses on the accuracy of upgrading to clinically significant prostate cancer (PCa) by multiparametric magnetic resonance imaging-targeted biopsy (MRI-TB) versus systematic biopsy (SB). We searched the Medline, Embase, Cochrane Central Register of Controlled Trials, Web of Science, Scopus, and Literatura Latino Americana em Ciências da Saúde databases through January 2020 for comparative, retrospective/prospective, paired-cohort, and randomized clinical trials with paired comparisons. The population consisted of patients with low-risk PCa in active surveillance with at least 1 index lesion on imaging. We evaluated the quality of evidence by using the Quality Assessment of Diagnostic Accuracy Studies-2 score. Group comparisons considered the differences between the area under the curve summary receiver operating characteristic curve in a 2-tailed method. We also compared the positive predictive value of the best single method (MRI-TB or SB) and the referral study test (combined biopsy, a combination of MRI-TB and SB). The meta-analysis included 6 studies enrolling 741 patients. The pooled sensitivity for the 2 groups was 0.79 (95% confidence interval, 0.74-0.83; I2 = 75%) and 0.67 (95% confidence interval, 0.63-0.74; I2 = 55.4%), respectively. The area under the curve for the MRI-TB and SB groups were 0.99 and 0.92 (P < .001), respectively. The positive predictive value for the MRI-TB and combined biopsy groups were similar. The accumulated evidence suggests better results for MRI-TB compared with SB. Therefore, use of MRI-TB alone may be preferable in patients in active surveillance harboring low-risk PCa. 相似文献
179.
180.