This article may be expanded with text translated from the corresponding article in español. (November 2011) Click [show] for important translation instructions.
View a machine-translated version of the español article.
Google's machine translation is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia.
Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.