全文获取类型
收费全文 | 862476篇 |
免费 | 70494篇 |
国内免费 | 1843篇 |
专业分类
耳鼻咽喉 | 12800篇 |
儿科学 | 24634篇 |
妇产科学 | 25111篇 |
基础医学 | 124264篇 |
口腔科学 | 25496篇 |
临床医学 | 75370篇 |
内科学 | 164643篇 |
皮肤病学 | 16977篇 |
神经病学 | 70083篇 |
特种医学 | 35207篇 |
外国民族医学 | 171篇 |
外科学 | 136176篇 |
综合类 | 24615篇 |
现状与发展 | 2篇 |
一般理论 | 263篇 |
预防医学 | 66881篇 |
眼科学 | 20519篇 |
药学 | 64721篇 |
中国医学 | 1597篇 |
肿瘤学 | 45283篇 |
出版年
2018年 | 7341篇 |
2015年 | 7732篇 |
2014年 | 11123篇 |
2013年 | 16796篇 |
2012年 | 22729篇 |
2011年 | 23843篇 |
2010年 | 13869篇 |
2009年 | 13068篇 |
2008年 | 22586篇 |
2007年 | 24653篇 |
2006年 | 24506篇 |
2005年 | 24156篇 |
2004年 | 23722篇 |
2003年 | 22854篇 |
2002年 | 21942篇 |
2001年 | 35843篇 |
2000年 | 36477篇 |
1999年 | 30903篇 |
1998年 | 9221篇 |
1997年 | 8547篇 |
1996年 | 8476篇 |
1995年 | 8008篇 |
1994年 | 7724篇 |
1992年 | 26665篇 |
1991年 | 26104篇 |
1990年 | 25621篇 |
1989年 | 24677篇 |
1988年 | 23228篇 |
1987年 | 22892篇 |
1986年 | 21743篇 |
1985年 | 21098篇 |
1984年 | 16389篇 |
1983年 | 13997篇 |
1982年 | 8855篇 |
1981年 | 8205篇 |
1980年 | 7672篇 |
1979年 | 16736篇 |
1978年 | 12114篇 |
1977年 | 10181篇 |
1976年 | 9329篇 |
1975年 | 10148篇 |
1974年 | 12642篇 |
1973年 | 12137篇 |
1972年 | 11538篇 |
1971年 | 10685篇 |
1970年 | 10218篇 |
1969年 | 9909篇 |
1968年 | 8900篇 |
1967年 | 8230篇 |
1966年 | 7654篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
PHILLIPS ROSALIND; CARSON PETER; HAITES NEVA; JOHNSTON ALAN; CLARKE CYRIL; WHITEFIELD A. G. W. 《QJM : monthly journal of the Association of Physicians》1987,63(2):441-448
A Comparison of mortality from ischaemic heart disease underthe age of 60 for 1980 to 1981 between the Grampian Health Boardand the North Staffordshire Health Authority has been made.A total of 993 deaths was notified by death certificate fromthe two areas of similar population of which 434 were from Grampianand 559 from North Staffordshire. After examination of generalpractitioner and hospital case notes, autopsy reports and deathcertificates, nearly all (532) of the North Staffordshire deathswere accepted as being due to ischaemic heart disease but onlythree-fifths (263) of the Grampian deaths could be begin besubstantiated as there was inadequate information for the remainder.Deaths from ischaemic heart disease seem apparently to be twofoldgreater in North Staffordshire than Grampian but much of thisdiscrepancy could be attributed to a widely different autopsyrate and to unavailability of case notes. Experience of thissurvey suggests that the results of other epidemiological investigationsmay be equally or even more unreliable. 相似文献
993.
994.
995.
Wing‐Hong Li Moon‐Tong Cheung Candace N.S. Ho Ting‐Pong Fung Kai‐Ming Ko Kelvin K.W. Yau 《Surgical Practice》2007,11(4):138-143
Aim: To examine the survival benefit of liver and lung resection for colorectal metastasis and the potential prognostic factors that affect patient survival. Methods: All patients who had resection of lung or liver metastasis for colorectal metastasis in Queen Elizabeth Hospital, Hong Kong from 1995 to 2004 were retrospectively reviewed. The overall and disease‐free survival was analysed, in particularly between liver and lung metastasis. All factors that may have affected the survival were entered into Cox's proportional hazards regression model to identify significant variables associated with survival. Results: At 5 years, the overall survival of patients who had resection of lung and liver metastasis was 44% and 38%, respectively; the disease‐free survival was 26% and 24%, respectively. Overall and disease‐free survival of patients with resection of lung metastasis was comparable to those with resection of liver metastasis. The differentiations of primary tumour and time to metastasis were shown to be significant prognostic factors influencing overall survival. Those patients with systemic chemotherapy after resection of colorectal metastasis demonstrated a significantly higher probability of overall survival. Conclusion: Resection of lung and liver metastases from colorectal origin was safe and both procedures improved survival. The use of chemotherapy after resection of metastasis significantly improved the overall survival. 相似文献
996.
Donald B. Penzien PhD ; Frank Andrasik PhD ; Brian M. Freidenberg PhD ; Timothy T. Houle PhD ; Alvin E. Lake III PhD; Gay L. Lipchik PhD ; Kenneth A. Holroyd PhD ; Richard B. Lipton MD ; Douglas C. McCrory MD ; Justin M. Nash PhD ; Robert A. Nicholson PhD ; Scott W. Powers PhD ABPP ; Jeanetta C. Rains PhD ; David A. Wittrock PhD 《Headache》2005,45(S2):S110-S132
Guidelines for design of clinical trials evaluating behavioral headache treatments were developed to facilitate production of quality research evaluating behavioral therapies for management of primary headache disorders. These guidelines were produced by a Workgroup of headache researchers under auspices of the American Headache Society. The guidelines are complementary to and modeled after guidelines for pharmacological trials published by the International Headache Society, but they address methodologic considerations unique to behavioral and other nonpharmacological treatments. Explicit guidelines for evaluating behavioral headache therapies are needed as the optimal methodology for behavioral (and other nonpharmacologic) trials necessarily differs from the preferred methodology for drug trials. In addition, trials comparing and integrating drug and behavioral therapies present methodological challenges not addressed by guidelines for pharmacologic research. These guidelines address patient selection, trial design for behavioral treatments and for comparisons across multiple treatment modalities (eg, behavioral vs pharmacologic), evaluation of results, and research ethics. Although developed specifically for behavioral therapies, the guidelines may apply to the design of clinical trials evaluating many forms of nonpharmacologic therapies for headache. 相似文献
997.
998.
J Heckenkamp K Lieder E Lang M Aleksic M S Bendel M Gawenda J W U Fries J S Brunkwall 《European journal of vascular and endovascular surgery》2005,29(5):463-469
OBJECTIVES: The aim of this study was to investigate if radiation therapy (RT) favorably modulates wound healing at vein graft anastomoses. MATERIALS AND METHODS: Jugular vein grafts were sewn into carotid arteries in 32 rats which were randomly divided into two groups: RT (gamma source, 14 Gray, n=16) and control (C, sham irradiation, n=16). Grafts and adjacent arteries were analyzed at 2 (n=8) and 8 weeks (n=8) by histology, immunohistochemistry, and morphometry. RESULTS: Although, RT did not reduce the overall occurrence of intimal hyperplasia, the distribution differed. RT led to a reduction of intimal hyperplasia in arterial segments (median: C: 41.873 microm2; RT: 6.452 microm2, p < 0.0007). In contrast, RT augmented intimal hyperplasia in vein grafts (median: C: 30.287 microm2; RT: 90.455 microm2, p < 0.014). Vein graft diameters after RT were enlarged (median: C: 2.098 microm; RT: 3.381, p < 0.031). Over 80% of the cells were of mesenchymal origin in both groups. CONCLUSIONS: RT reduced intimal hyperplasia in arterial segments. However, RT led to graft dilatation and increased intimal hyperplasia in vein grafts. RT did not favorably modulate the vascular wound healing response in this model. 相似文献
999.
1000.