Medical authors before Samantabhadra

The editor says Jain medicine has come down from the Lord's divine voice through the gaṇadharas and their disciples, and that medical authors are known even before Samantabhadra: sages of the second or third century BCE who practised austerities on the Indragiri and Candragiri hills at Hāḍaḷḷi (Saṅgītapura) near Gerasappā, where he has seen the remains. Samantabhadra's own references to a Jain sage on the Bhallātaka hill and to a science of rasa bound in Jain scripture lead him to infer earlier works on the subject.