全文获取类型
收费全文 | 1799685篇 |
免费 | 136780篇 |
国内免费 | 3124篇 |
专业分类
耳鼻咽喉 | 24457篇 |
儿科学 | 60091篇 |
妇产科学 | 51776篇 |
基础医学 | 254088篇 |
口腔科学 | 53056篇 |
临床医学 | 156957篇 |
内科学 | 349591篇 |
皮肤病学 | 38427篇 |
神经病学 | 142945篇 |
特种医学 | 75414篇 |
外国民族医学 | 566篇 |
外科学 | 274208篇 |
综合类 | 41340篇 |
现状与发展 | 3篇 |
一般理论 | 579篇 |
预防医学 | 140151篇 |
眼科学 | 41212篇 |
药学 | 134391篇 |
5篇 | |
中国医学 | 3133篇 |
肿瘤学 | 97199篇 |
出版年
2018年 | 18547篇 |
2017年 | 15830篇 |
2016年 | 16225篇 |
2015年 | 19929篇 |
2014年 | 25087篇 |
2013年 | 35469篇 |
2012年 | 52857篇 |
2011年 | 50529篇 |
2010年 | 29139篇 |
2009年 | 29501篇 |
2008年 | 46320篇 |
2007年 | 49433篇 |
2006年 | 50494篇 |
2005年 | 57396篇 |
2004年 | 59457篇 |
2003年 | 52743篇 |
2002年 | 46022篇 |
2001年 | 79159篇 |
2000年 | 79776篇 |
1999年 | 70912篇 |
1998年 | 18543篇 |
1997年 | 16875篇 |
1996年 | 16869篇 |
1995年 | 16592篇 |
1994年 | 15591篇 |
1993年 | 14680篇 |
1992年 | 60880篇 |
1991年 | 59472篇 |
1990年 | 58521篇 |
1989年 | 56489篇 |
1988年 | 52553篇 |
1987年 | 51803篇 |
1986年 | 49338篇 |
1985年 | 47320篇 |
1984年 | 35254篇 |
1983年 | 30223篇 |
1982年 | 17346篇 |
1981年 | 15430篇 |
1979年 | 33849篇 |
1978年 | 23273篇 |
1977年 | 19456篇 |
1976年 | 18186篇 |
1975年 | 19836篇 |
1974年 | 24322篇 |
1973年 | 23206篇 |
1972年 | 21423篇 |
1971年 | 20269篇 |
1970年 | 18608篇 |
1969年 | 17499篇 |
1968年 | 15981篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
Jessica K. Perrotte Michael R. Baumann Raymond T. Garza Willie J. Hale 《Ethnicity & health》2020,25(1):47-64
ABSTRACTObjectives: The present study investigated the relationships of enculturation and depressive symptoms with health risk behavior engagement in Mexican-American college students and examined how these relationships differed by gender. Previous research has noted consistent gender differences in health risk behavior (e.g. alcohol use, substance use, and risky sexual behavior) among Latina/os, and emphasized the role of U.S. acculturation in this difference. Research examining the role of heritage cultural retention (i.e. enculturation), and including the added influence of mental health variables, such as depressive symptoms, is currently lacking. This study sought to address this gap.Design: A large sample (N?=?677) of Mexican-American college students from four universities (located in New York, California, Florida, and Texas) completed an online questionnaire assessing health risk behaviors and corresponding variables.Results: We found that males who endorsed more behavioral enculturation and depressive symptoms were more likely to engage in health risk behavior than all others in the sample. Contrary to previous literature, no relationship was found between behavioral enculturation and health risk behavior in females.Conclusion: The current study found behavioral enculturation to be associated with depressive symptoms, and in turn with health risk behaviors among the males in our sample. Additional research will be needed to identify the mechanism underlying the relationship between enculturation and depressive symptoms as well as between depressive symptoms and risky behavior. 相似文献
73.
F. Murina R. Felice S. Di Francesco L. Nelvastellio I. Cetin 《Gynecological endocrinology》2020,36(5):431-435
AbstractThis study is a single-center, retrospective analysis of postmenopausal women presenting with dyspareunia and vulvar pain, aiming to evaluate relative effectiveness of vestibular CO2 laser therapy as a treatment. Three monthly sessions of laser were performed to each patient and thereafter a three-months follow-up was stablished. A total number of 72 patients undergoing vestibular laser treatment were recruited from patient files in the period between 2016 and 2018. Among these, 39 women also received a concomitant treatment with ospemifene (60?mg/day) during the study period. There was a statistically significant reduction of all the symptoms in both groups up to the three month follow-up. Regarding dryness and dyspareunia, the relief tent to be more prominent in the ospemifene?+?laser group at all follow-ups and remained statistically significant at three-month follow-up. Specifically, vestibular dryness was significantly lower in the ospemifene?+?laser group compared with the laser treatment group (?87% vs???34%, respectively), and the vestibular health score started declining faster in the ospemifene?+?laser group. Although, additional research is needed to understand the mechanism of action, our data shows that a combination regimen of laser and ospemifene may improve clinical effectiveness for long-term treatment of symptoms associated with the under-recognized genitourinary syndrome of menopause. 相似文献
74.
75.
76.
77.
Changes in Right Ventricular Shape and Deformation Following Coronary Artery Bypass Surgery—Insights from Echocardiography with Strain Rate and Magnetic Resonance Imaging 下载免费PDF全文
78.
79.
80.
Bj?rn Stessel Audrey A. Fiddelers Elbert A. Joosten Daisy M.N. Hoofwijk Hans-Fritz Gramke Wolfgang F.F.A. Buhre 《Medicine》2015,94(39)
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery. 相似文献