Broken link in disadvantages section

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Last bullet point in disadvantages section: The usual guidelines for healthy computer use apply (( the intention of the link. Possible replacement? :

Meg.goodine (talk)05:22, 13 August 2014

Thanks Meg,

Well spotted case of link rot. I've used your suggest link and added one from Princeton Uni.

Mackiwg (talk)10:39, 13 August 2014