From: Reduced inclination of cervical spine in a novel notebook screen system - implications for rehabilitation
Position 0
Position 1
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Position 4
X
φ = 1.7*
φ = 1,6
φ = 2.2
φ = 1,9
φ = 2.5
φ = 2.8**
φ = 1.8
φ = 2.6**
φ = 2.7**
φ = 2.9*