全文获取类型
收费全文 | 139763篇 |
免费 | 32103篇 |
国内免费 | 1248篇 |
专业分类
耳鼻咽喉 | 2886篇 |
儿科学 | 3450篇 |
妇产科学 | 3178篇 |
基础医学 | 8470篇 |
口腔科学 | 5974篇 |
临床医学 | 30011篇 |
内科学 | 33253篇 |
皮肤病学 | 4259篇 |
神经病学 | 16081篇 |
特种医学 | 5367篇 |
外国民族医学 | 2篇 |
外科学 | 25613篇 |
综合类 | 574篇 |
现状与发展 | 40篇 |
一般理论 | 76篇 |
预防医学 | 15598篇 |
眼科学 | 2980篇 |
药学 | 3591篇 |
中国医学 | 80篇 |
肿瘤学 | 11631篇 |
出版年
2024年 | 775篇 |
2023年 | 5367篇 |
2022年 | 1937篇 |
2021年 | 4268篇 |
2020年 | 6163篇 |
2019年 | 3209篇 |
2018年 | 8167篇 |
2017年 | 8174篇 |
2016年 | 8880篇 |
2015年 | 9165篇 |
2014年 | 11976篇 |
2013年 | 13949篇 |
2012年 | 6867篇 |
2011年 | 6565篇 |
2010年 | 8463篇 |
2009年 | 10540篇 |
2008年 | 5837篇 |
2007年 | 4831篇 |
2006年 | 5820篇 |
2005年 | 4207篇 |
2004年 | 3451篇 |
2003年 | 2951篇 |
2002年 | 2719篇 |
2001年 | 2284篇 |
2000年 | 1617篇 |
1999年 | 2168篇 |
1998年 | 2451篇 |
1997年 | 2204篇 |
1996年 | 2170篇 |
1995年 | 1905篇 |
1994年 | 1269篇 |
1993年 | 1102篇 |
1992年 | 1088篇 |
1991年 | 949篇 |
1990年 | 802篇 |
1989年 | 772篇 |
1988年 | 746篇 |
1987年 | 608篇 |
1986年 | 575篇 |
1985年 | 544篇 |
1984年 | 459篇 |
1983年 | 493篇 |
1982年 | 387篇 |
1981年 | 350篇 |
1980年 | 283篇 |
1979年 | 242篇 |
1978年 | 268篇 |
1977年 | 250篇 |
1976年 | 218篇 |
1974年 | 212篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Although psychoanalysis was the first-choice treatment for premature ejaculation (PE) between 1920 and 1960, hardly any reports on its efficacy have been published. Moreover, a scientific debate about its findings has never been fully developed. The recent progress that has been made in the classification of three different PE syndromes creates a new opportunity for psychoanalytic investigations of men with complaints of PE, distinguished by the actual duration of their intravaginal ejaculation latency time (IELT). The term premature-like ejaculatory dysfunction has been introduced to distinguish men with self-perceived PE at normal and long IELT durations from those men with lifelong, acquired and normal variable PE. Psychoanalytic research may contribute to a better understanding of the consequences of objective early ejaculations on the unconscious mental life of men with the four forms of PE. By integrating neurobiological, clinical and epidemiological data of ejaculatory performance, a revival of psychoanalytic research of PE in the four distinct, classified PE groups, will probably contribute to a deeper insight in to the unconscious mental life of men affected by PE. 相似文献
13.
14.
15.
16.
17.
ABSTRACT: Background: Although increases in perinatal mortality risk associated with fetal macrosomia are well documented, the optimal route of delivery for fetuses with suspected macrosomia remains controversial. The objective of this investigation was to assess the risk of neonatal death among macrosomic infants delivered vaginally compared with those delivered by cesarean section. Methods: Data were derived from the U.S. 1995–1999 Linked Live Birth‐Infant Death Cohort files and term (37–44 wk), single live births to United States resident mothers selected. A proportional hazards model was used to analyze the risk of neonatal death associated with cesarean delivery among 3 categories of macrosomic infants (infants weighing 4,000–4,499 g; 4,500–4,999 g; and 5,000+ g). Results: After controlling for maternal characteristics and complications, the adjusted hazard ratio for neonatal death associated with cesarean delivery among the 3 categories of macrosomic infants was 1.40, 1.30, and 0.85. Conclusions: Although cesarean delivery may reduce the risk of death for the heaviest infants (5,000+ g), the relative benefit of this intervention for macrosomic infants weighing 4,000–4,999 g remains debatable. Thus, policies in support of prophylactic cesarean delivery for suspected fetal macrosomia may need to be reevaluated. (BIRTH 33:4 December 2006) 相似文献
18.
19.
The purpose of this study was to investigate radiographic measurements in a cohort of patients with juvenile hallux valgus (with a hallux valgus angle > 15 degrees ) using standardized weightbearing x-rays compared with an age-matched control group. First metatarsal protrusion distance, metatarsus primus adductus angle, metatarsus adductus, first metatarsal cuneiform angle, calcaneal inclination angle, and talocalcaneal angles were assessed with discriminant functional analysis. A total of 37 sets of data were analyzed from patients with a mean age of 13.45 +/- 1.75 years. The study identified 2 significant components of juvenile hallux valgus: a positive first metatarsal protrusion distance (P <.001) and metatarsal primus adductus angle (P = .002). Discriminant functional analysis was then used to determine the best predictors of juvenile hallux valgus. This analysis allowed only 1 variable, metatarsal protrusion distance, as a predictor of whether juvenile hallux valgus was present (P < .001), with 94.3% accuracy. This study showed that a positive metatarsal protrusion distance is a significant component of juvenile hallux valgus. 相似文献
20.
Harvey A. Siegal PhD ; Paul J. Draus PhD ; Robert G. Carlson PhD ; Russel S. Falck MA ; Jichuan Wang PhD 《The Journal of rural health》2006,22(2):169-173
CONTEXT: Although the nonmedical use of stimulant drugs such as cocaine and methamphetamine is increasingly common in many rural areas of the United States, little is known about the health beliefs of people who use these drugs. PURPOSE: This research describes illicit stimulant drug users' views on health and health-related concepts that may affect their utilization of health care services. METHODS: A respondent-driven sampling plan was used to recruit 249 not-in-treatment, nonmedical stimulant drug users who were residing in 3 rural counties in west central Ohio. A structured questionnaire administered by trained interviewers was used to collect information on a range of topics, including current drug use, self-reported health status, perceived need for substance abuse treatment, and beliefs about health and health services. FINDINGS: Participants reported using a wide variety of drugs nonmedically, some by injection. Alcohol and marijuana were the most commonly used drugs in the 30 days prior to the interview. Powder cocaine was used by 72.3% of the sample, crack by 68.3%, and methamphetamine by 29.7%. Fair or poor health status was reported by 41.3% of the participants. Only 20.9% of the sample felt they needed drug abuse treatment. Less than one third of the sample reported that they would feel comfortable talking to a physician about their drug use, and 65.1% said they preferred taking care of their problems without getting professional help. CONCLUSIONS: Stimulant drug users in rural Ohio are involved with a range of substances and hold health beliefs that may impede health services utilization. 相似文献