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articles  Most-Read Articles · Current Issue · The Latest · Spotlight: Authoritarianism · Editor's Pick · Book Reviews · More Book Reviews  Articles · The association between HIV infection, disability and lifestyle activity among middle-aged and older adults: an analytical cross-sectional study in

Providing access to millions of research articles and chapters from Science, Technology and Medicine, and Humanities and Social Sciences  The seven articles make up the structural constitution, signed on September 17, 1787, and ratified on June 21, 1788

Most-Read Articles · Current Issue · The Latest · Spotlight: Authoritarianism · Editor's Pick · Book Reviews · More Book Reviews  arXiv is a free distribution service and an open-access archive for nearly million scholarly articles in the fields of physics, mathematics, computer