全文获取类型
收费全文 | 9322篇 |
免费 | 959篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 165篇 |
儿科学 | 381篇 |
妇产科学 | 203篇 |
基础医学 | 1249篇 |
口腔科学 | 97篇 |
临床医学 | 940篇 |
内科学 | 1591篇 |
皮肤病学 | 357篇 |
神经病学 | 1008篇 |
特种医学 | 307篇 |
外科学 | 1260篇 |
综合类 | 241篇 |
一般理论 | 5篇 |
预防医学 | 1216篇 |
眼科学 | 134篇 |
药学 | 669篇 |
中国医学 | 4篇 |
肿瘤学 | 484篇 |
出版年
2021年 | 94篇 |
2020年 | 68篇 |
2019年 | 112篇 |
2018年 | 133篇 |
2017年 | 124篇 |
2016年 | 94篇 |
2015年 | 116篇 |
2014年 | 191篇 |
2013年 | 295篇 |
2012年 | 326篇 |
2011年 | 364篇 |
2010年 | 214篇 |
2009年 | 209篇 |
2008年 | 393篇 |
2007年 | 494篇 |
2006年 | 412篇 |
2005年 | 367篇 |
2004年 | 369篇 |
2003年 | 361篇 |
2002年 | 347篇 |
2001年 | 343篇 |
2000年 | 405篇 |
1999年 | 309篇 |
1998年 | 147篇 |
1997年 | 92篇 |
1996年 | 113篇 |
1995年 | 109篇 |
1994年 | 111篇 |
1993年 | 101篇 |
1992年 | 271篇 |
1991年 | 220篇 |
1990年 | 254篇 |
1989年 | 218篇 |
1988年 | 211篇 |
1987年 | 199篇 |
1986年 | 188篇 |
1985年 | 211篇 |
1984年 | 134篇 |
1983年 | 93篇 |
1982年 | 103篇 |
1981年 | 78篇 |
1980年 | 76篇 |
1979年 | 116篇 |
1978年 | 100篇 |
1977年 | 83篇 |
1976年 | 88篇 |
1975年 | 82篇 |
1974年 | 93篇 |
1973年 | 94篇 |
1972年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 388 毫秒
81.
A 41-year-old man who underwent coronary artery bypass grafting using a gastroepiploic artery graft to the left circumflex coronary artery is reported. Subselective angiography of the right gastroepiploic artery using a steerable guidewire and coaxial catheter system is described. 相似文献
82.
83.
84.
85.
86.
87.
88.
89.
90.
Hector S. Izurieta Patrick Zuber Jan Bonhoeffer Robert T. Chen Osman Sankohg Kayla F. Laserson Miriam Sturkenboom Christian Loucq Daniel Weibel Caitlin Dodd Steve Black 《Vaccine》2013
With the advent of new vaccines targeted to highly endemic diseases in low- and middle-income countries (LMIC) and with the expansion of vaccine manufacturing globally, there is an urgent need to establish an infrastructure to evaluate the benefit-risk profiles of vaccines in LMIC. Fortunately the usual decade(s)-long time gap between introduction of new vaccines in high and low income countries is being significantly reduced or eliminated due to initiatives such as the Global Alliance for Vaccines and Immunizations (GAVI) and the Decade of Vaccines for the implementation of the Global Vaccine Action Plan. While hoping for more rapid disease control, this time shift may potentially add risk, unless appropriate capacity for reliable and timely evaluation of vaccine benefit-risk profiles in some LMIC's are developed with external assistance from regional or global level. An ideal vaccine safety and effectiveness monitoring system should be flexible and sustainable, able to quickly detect possible vaccine-associated events, distinguish them from programmatic errors, reliably and quickly evaluate the suspected event and its association with vaccination and, if associated, determine the benefit-risk of vaccines to inform appropriate action. Based upon the demonstrated feasibility of active surveillance in LMIC as shown by the Burkina Faso assessment of meningococcal A conjugate vaccine or that of rotavirus vaccine in Mexico and Brazil, and upon the proof of concept international GBS study, we suggest a sustainable, flexible, affordable and timely international collaborative vaccine safety monitoring approach for vaccines being newly introduced. While this paper discusses only the vaccine component, the same system could also be eventually used for monitoring drug effectiveness (including the use of substandard drugs) and drug safety. 相似文献