Comparator Loss: An Ordinal Contrastive Loss to Derive a Severity Score for Speech-based Health Monitoring. - Jacob J. Webber; Oliver Watts; Lovisa Wihlborg; David Wheatley; Johnny Tam; Christine Weaver; Suvankar Pal; Siddharthan Chandran; Cassia Valentini-Botinhao (CoRR, 2025)