Enlaces:
[1] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=4093&Itemid=40900&lang=es
[2] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=4092&Itemid=40900&lang=es
[3] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=4094&Itemid=40900&lang=es
[4] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=4848&Itemid=40900&lang=es
[5] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=5914&Itemid=40900&lang=es
[6] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=7496&Itemid=40900&lang=es
[7] http://www.paho.org/hq/index.php?option=com_topics&view=rdmore&cid=4100&Itemid=40900&lang=es
[8] http://infomed.sld.cu/noticia/2016/01/06/comienza-en-cuba-aplicacion-de-vacuna-antipoliomielitica-inactivada-vpi
[9] http://www.who.int/publications/list/polio-strategy-2013/es/
[10] http://www.paho.org/hq/index.php?option=com_topics&view=article&id=257&Itemid=40900&lang=es