全文获取类型
收费全文 | 584277篇 |
免费 | 58900篇 |
国内免费 | 5264篇 |
专业分类
耳鼻咽喉 | 11129篇 |
儿科学 | 15801篇 |
妇产科学 | 14266篇 |
基础医学 | 63943篇 |
口腔科学 | 15946篇 |
临床医学 | 61306篇 |
内科学 | 134767篇 |
皮肤病学 | 16810篇 |
神经病学 | 46936篇 |
特种医学 | 22211篇 |
外国民族医学 | 83篇 |
外科学 | 109426篇 |
综合类 | 10444篇 |
现状与发展 | 73篇 |
一般理论 | 74篇 |
预防医学 | 29602篇 |
眼科学 | 13831篇 |
药学 | 35982篇 |
1篇 | |
中国医学 | 2331篇 |
肿瘤学 | 43479篇 |
出版年
2023年 | 5702篇 |
2021年 | 6479篇 |
2020年 | 8176篇 |
2019年 | 5744篇 |
2018年 | 13036篇 |
2017年 | 11672篇 |
2016年 | 12975篇 |
2015年 | 13420篇 |
2014年 | 22266篇 |
2013年 | 25079篇 |
2012年 | 18305篇 |
2011年 | 18694篇 |
2010年 | 18197篇 |
2009年 | 21374篇 |
2008年 | 17453篇 |
2007年 | 16871篇 |
2006年 | 19013篇 |
2005年 | 15476篇 |
2004年 | 14052篇 |
2003年 | 12688篇 |
2002年 | 12308篇 |
2001年 | 33621篇 |
2000年 | 33400篇 |
1999年 | 28297篇 |
1998年 | 9314篇 |
1997年 | 8116篇 |
1996年 | 7558篇 |
1995年 | 7013篇 |
1994年 | 5372篇 |
1993年 | 4685篇 |
1992年 | 18473篇 |
1991年 | 17212篇 |
1990年 | 16264篇 |
1989年 | 16156篇 |
1988年 | 14550篇 |
1987年 | 13838篇 |
1986年 | 12874篇 |
1985年 | 11881篇 |
1984年 | 8176篇 |
1983年 | 6685篇 |
1982年 | 3582篇 |
1979年 | 6372篇 |
1978年 | 4084篇 |
1977年 | 3706篇 |
1975年 | 3307篇 |
1974年 | 3734篇 |
1973年 | 3517篇 |
1972年 | 3541篇 |
1971年 | 3347篇 |
1970年 | 3102篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
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
72.
73.
74.
75.
Y. Ermias I.A. Morgan K.M. Curtis M.K. Whiteman L.G. Horton L.B. Zapata 《Contraception》2019,99(5):300-305
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception. 相似文献
76.
Prevention Science - This study aimed to evaluate the effectiveness of the drug and violence resistance educational program (PROERD) on short-term secondary outcomes, such as intentions to use... 相似文献
77.
78.
Marie V. Plaisime PhD MPH Marie Jipguep-Akhtar PhD Joseph J. Locascio PhD Harolyn M. E. Belcher MD MHS Rachel R. Hardeman PhD MPH Katherine Picho-Kiroga PhD Sylvia P. Perry PhD Sean M. Phelan PhD MPH Michelle van Ryn PhD LMFT MPH John F. Dovidio PhD 《Health services research》2023,58(Z2):229-237
Objective
To examine the experience of interracial anxiety among health professionals and how it may affect the quality of their interactions with patients from racially marginalized populations. We explored the influence of prior interracial exposure—specifically through childhood neighborhoods, college student bodies, and friend groups—on interracial anxiety among medical students and residents. We also examined whether levels of interracial anxiety change from medical school through residency.Data Source
Web-based longitudinal survey data from the Medical Student Cognitive Habits and Growth Evaluation Study.Study Design
We used a retrospective longitudinal design with four observations for each trainee. The study population consisted of non-Black US medical trainees surveyed in their 1st and 4th years of medical school and 2nd and 3rd years of residency. Mixed effects longitudinal models were used to assess predictors of interracial anxiety and assess changes in interracial anxiety scores over time.Principal Findings
In total, 3155 non-Black medical trainees were followed for 7 years. Seventy-eight percent grew up in predominantly White neighborhoods. Living in predominantly White neighborhoods and having less racially diverse friends were associated with higher levels of interracial anxiety among medical trainees. Trainees' interracial anxiety scores did not substantially change over time; interracial anxiety was highest in the 1st year of medical school, lowest in the 4th year, and increased slightly during residency.Conclusions
Neighborhood and friend group composition had independent effects on interracial anxiety, indicating that premedical racial socialization may affect medical trainees' preparedness to interact effectively with diverse patient populations. Additionally, the lack of substantial change in interracial anxiety throughout medical training suggests the importance of providing curricular tools and structure (e.g., instituting interracial cooperative learning activities) to foster the development of healthy interracial relationships. 相似文献79.
80.