With reference to his reply to question 1334 on 5 May 2022 about age-specific excess deaths since March 2020, which states that 6 779 excess deaths were recorded for the age group 0-9 years, 1 803 for the age group 10-19 years and 4 709 for the age group 20-29 years, what proportion of the excess deaths does the SA Medical Research Council estimate to be directly attributable to (a) COVID-19 and (b) non-COVID-19 factors for each of the specified age groups