From: Tomographic evaluation of the influence of the placement of a collagen membrane subjacent to the sinus mucosa during maxillary sinus floor augmentation: a randomized clinical trial
Sex
Age (years)
Smokers
Side
No-membrane
5 females, 4 males
55.8 ± 9.3
None
5 right, 4 left
Membrane
6 females, 3 males
53.4 ± 9.7
6 right, 3 left