Can You Learn Perfect Pitch?

Some people can identify a pitch without even looking at sheet music. Is it something they're born with or can it be learned?

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Sources:
http://www.sciencedirect.com/science/article/pii/S0010027715000621
https://www.researchgate.net/publication/41194498_Learning_the_Special_Note_Evidence_for_a_Critical_Period_for_Absolute_Pitch_Acquisition
https://www.sciencedaily.com/releases/2015/05/150528123917.htm
https://news.uchicago.edu/article/2015/05/28/acquiring-perfect-pitch-may-be-possible-some-adults
https://www.ncbi.nlm.nih.gov/books/NBK11007/
http://www.apa.org/monitor/feb05/pitch.aspx
http://asa.scitation.org/doi/10.1121/1.4808626
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Images:
https://commons.wikimedia.org/wiki/File:Mozart-small.jpg
https://commons.wikimedia.org/wiki/File:Hands-music-musician-piano_(23958938169).jpg

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