全文获取类型
收费全文 | 1165篇 |
免费 | 49篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 41篇 |
妇产科学 | 34篇 |
基础医学 | 94篇 |
口腔科学 | 9篇 |
临床医学 | 199篇 |
内科学 | 168篇 |
皮肤病学 | 13篇 |
神经病学 | 33篇 |
特种医学 | 139篇 |
外科学 | 75篇 |
综合类 | 28篇 |
预防医学 | 162篇 |
眼科学 | 2篇 |
药学 | 78篇 |
肿瘤学 | 204篇 |
出版年
2022年 | 6篇 |
2021年 | 11篇 |
2020年 | 2篇 |
2019年 | 15篇 |
2018年 | 7篇 |
2017年 | 11篇 |
2016年 | 12篇 |
2015年 | 16篇 |
2014年 | 21篇 |
2013年 | 28篇 |
2012年 | 43篇 |
2011年 | 37篇 |
2010年 | 43篇 |
2009年 | 44篇 |
2008年 | 59篇 |
2007年 | 99篇 |
2006年 | 43篇 |
2005年 | 35篇 |
2004年 | 38篇 |
2003年 | 39篇 |
2002年 | 26篇 |
2001年 | 43篇 |
2000年 | 40篇 |
1999年 | 33篇 |
1998年 | 29篇 |
1997年 | 41篇 |
1996年 | 31篇 |
1995年 | 28篇 |
1994年 | 41篇 |
1993年 | 35篇 |
1992年 | 42篇 |
1991年 | 23篇 |
1990年 | 27篇 |
1989年 | 24篇 |
1988年 | 36篇 |
1987年 | 28篇 |
1986年 | 17篇 |
1985年 | 20篇 |
1984年 | 10篇 |
1983年 | 7篇 |
1982年 | 15篇 |
1981年 | 7篇 |
1980年 | 13篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1977年 | 11篇 |
1976年 | 11篇 |
1975年 | 14篇 |
1973年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有1282条查询结果,搜索用时 15 毫秒
1.
2.
Emmanuel Blot Elsie Staub 《Journal of clinical oncology》2003,21(20):3887; author reply 3887-3887; author reply 3888
3.
4.
Wong-Ho Chow Leonard M. Schuman Joseph K. McLaughlin Erik Bjelke Gloria Gridley Sholom Wacholder Harvey T. Co Chien William J. Blot 《Cancer causes & control : CCC》1992,3(3):247-254
In 1966, a cohort of White males aged 35 or over, who were policy-holders with the Lutheran Brotherhood Insurance Society (United States), completed a mail questionnaire on tobacco use, diet, and demographic characteristics. During the 20 years of follow-up, 219 lung cancer deaths occurred. Besides the strong relationship with cigarette smoking, we observed an effect on lung cancer risk among current users of cigars or pipes who were nonsmokers of cigarettes (relative risk [RR]=3.5, 95 percent confidence interval[CI]=1.0–12.6) or who were past/occasional users of cigarettes (RR=2.7, CI=1.4–5.3). In addition, elevated risks (from 1.5 to 2.6) of lung cancer were found among craftsmen and laborers, with the highest risks among subjects who worked in the mining or manufacturing industry. No association between current (as of 1966) use of beer or hard liquor and lung cancer was observed, although past users were at elevated risk. An inverse association between lung cancer and intake of fruits was observed, and risks of lung cancer were lower among persons in the highest dietary intake quintiles of vitamins A and C. Except for oranges, however, none of the inverse associations with fruits or dietary nutrients had statistically significant trends. The findings from this cohort study add to the evidence of an adverse effect of cigar/pipe smoking and possibly protective effect of dietary factors on lung cancer risk. 相似文献
5.
6.
Second primary tumors in patients with oral cancer. 总被引:7,自引:0,他引:7
BACKGROUND. Patients with cancer of the oral cavity and pharynx have been described to be particularly susceptible to the development of new cancers. METHODS. Using data collected during 1973-1987 by nine population-based cancer registries in the United States, the authors evaluated risks of second primary cancers among 21,371 patients in whom oral and pharyngeal cancers were diagnosed. RESULTS. The rate of development of second tumors was 3.7% per year. The risk of a second primary cancer was 2.8 times greater than expected, with 20-fold excesses of second oral or esophageal cancers and 4-fold to 7-fold increases of respiratory cancers. Increased risks persisted unabated for cancers diagnosed 5 or more years after oral cancer, suggesting that the second cancers were new primary tumors and not misdiagnosed metastases. The increased risks of second primary tumors were found among both men and women and black and white patients; they were most prominent among patients who were 60 years or younger. CONCLUSIONS. The exceptionally high rate of cancer recurrence among patients with oral cancer (exceeding that for all other cancers) points to the need for close medical surveillance. Special emphasis should be placed on advising patients to avoid or limit consumption of tobacco and alcohol, the main risk factors for oral and most second cancers. 相似文献
7.
8.
AR Jones BSC AJP Sandison FRCS WJ Owen MS FRCS 《International journal of clinical practice》1997,51(5):294-295
Pre-clerking of all patients undergoing elective general surgical operations was introduced at our hospital in an attempt to reduce an unacceptably high operation cancellation rate. A prospective audit has been performed on the effect of this policy on the cancellation rate. Before the introduction of pre-clerking there was a marked seasonal variation in the number of patients who failed to attend for surgery, which could be explained by absence on holiday. This seasonal variation disappeared after the start of pre-clerking clinics, but there has been no reduction in the number of cancellations for medical reasons. 相似文献
9.
10.
Lung cancer and prior tuberculosis infection in Shanghai 总被引:1,自引:0,他引:1
W Zheng W J Blot M L Liao Z X Wang L I Levin J J Zhao J F Fraumeni Y T Gao 《British journal of cancer》1987,56(4):501-504
In a population-based case-control study of lung cancer in Shanghai involving interviews during 1984-86 with 1,405 cancer patients and 1,495 controls, a significant 50% elevation in the risk of lung cancer, adjusted for cigarette smoking, was observed among persons who had a history of tuberculosis. Among those diagnosed with tuberculosis within the past 20 years, the risk exceeded 2.5-fold. In males the lung cancers tended to occur on the same side as the previous tuberculosis infection. For both sexes, the effect of recent tuberculosis was most apparent for adenocarcinoma and peripheral tumours. No relationship was found between lung cancer risk and the type of tuberculosis therapy, including use of isoniazid. The findings suggest that tuberculosis may predispose to lung cancer, with the association most apparent among recent survivors of the infection. 相似文献