Evaluation of the user seal check on gross leakage detection of 3 different designs of N95 filtering facepiece respirators.

Background: The use of N95 respirators prevents spread of respiratory infectious agents, but leakage hampers its protection. Manufacturers recommend a user seal check to identify on-site gross leakage. However, no empirical evidence is provided.

Preliminary investigation on prevalence of osteoporosis and osteopenia: Should we tune our focus on healthy adults?

Aim: Osteoporosis and osteopenia are global health problems with increasing trend, particularly in developed regions. Apart from traditional well-recognized high-risk groups (i.e.