Comprehensive Sickness Insurance - PhD

[benuix]

Hi all. I plan to apply for the EEA Residence Card.
A prerequisite for this is to have evidence of Comprehensive Sickness Insurance.
I was doing my PhD for the largest period of my staying here, and I didn't have any individual sickness insurance.
Is there some way to do that retrospectively?
e.g. pay for sickness insurance for the previous years?
Thank you!

[secret.simon]

To the best of my knowledge, there is no way of acquiring any type of insurance (including Comprehensive Sickness insurance) retrospectively.