Citas múltiples (citar varias fuentes a la vez)
1. Ejemplo sin mencionar al autor
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Ingestion of toxic amounts of vitamin A has long been known to have adverse skeletal effects (1,2), In animals, retinoic acid suppresses osteoblast activity (3), stimulates osteoclast formation (4), and antagonizes the ability of vitamin D to maintain normal serum calcium levels (5), all of which may contribute to the accelerated bone resorption and fractures observed with hypervitaminosis A (5-8).
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2. Ejemplo uso de superíndice
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Ingestion of toxic amounts of vitamin A has long been known to have adverse skeletal effects1,2, In animals, retinoic acid suppresses osteoblast activity3,11, stimulates osteoclast formation4, and antagonizes the ability of vitamin D to maintain normal serum calcium levels5, all of which may contribute to the accelerated bone resorption and fractures observed with hypervitaminosis A5-7.
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