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According to the Gass classification, what differentiates a stage 3 macular hole from a stage 4 macular hole?
1. The fact that a stage 4 macular hole is greater than 400 microns
2. The fact that a stage 3 macular hole is greater than 400 microns
3. The fact that stage 3 macular holes are associated with a posterior vitreous detachment
4. The fact that stage 4 macular holes are associated with a posterior vitreous
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