Face-to-face interviews were suspended in mid-March 2020 in response to the coronavirus (COVID-19) pandemic and all interviews were conducted over the phone.
Cafodd cyfweliadau wyneb-yn-wyneb eu hatal ym mis Mawrth 2020 yn sgil pandemig y coronafeirws (COVID-19), a chynhaliwyd yr holl gyfweliadau dros y ffôn.