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.

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.

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.