Formulations of cross-linkable polymers, capable of forming non-toxic and biocompatible hydrogels in situ, containing at least one of doxycycline or minocycline. Lower end surfaces of a pair of holders are arranged facing toward each other so that the lower end surfaces of the connecting portion are in substantial contact with each other. The recording coordination application substantially continuously monitors the state of the recording activities and coordinates the community of users to reduce any gaps in coverage.