In Hong Kong, “close contact” means fifteen minutes at a distance of less than six feet and without the use of a surgical mask; in Singapore, thirty minutes. If the exposure is shorter than the prescribed limit but within six feet for more than two minutes, workers can stay on the job if they wear a surgical mask and have twice-daily temperature checks.
Close contact
The differences between calendar age and bone age according to G&P were relatively small compared with normal variance and are unlikely to be of clinical importance.
The maximum normal difference between chronological age and bone age can only be 6 months. The more the difference, the more likely the pathology
It was 12.1 years for boys and 10.2 years for girls. The timing of ossification of the sesamoid of the thumb is widely variable. Ossification of this sesamoid should not be used as a precise indicator when determining bone age using the atlas by Greulich and Pyle.
Avoid using Sesamoid for Bone age estimation