Does using an ipad or tablet cause long term effects in children?

The effects of long screen time using tablets at an early age in our schools.
This article highlighted some very valid points

1. Tv is sedentary and not interactive
2. Apps for learning require many cognitive skills and interaction.

Killman, F. (2013). Child's play. Venture Magazine, 4(18), 6-7. Retrieved June 4, 2013, from swinburne.edu.au/magazine/pdfs/Venture_1_2013.pdf
 http://www.swinburne.edu.au/magazine/pdfs/Venture_1_2013.pdf