Anonymized Therapeutic Conversation Datasets For Language Model Development

I am currently building a language model centered around therapeutic conversations, intending to propel advancements in mental health technology.
My project requires access to comprehensive, anonymized datasets of therapeutic dialogue.
I’d like to request any guidance toward potential resources, including but not limited to open-source repositories, academic literature, or online forums. Furthermore, any guidance on best practices when dealing with this type of sensitive data would be greatly appreciated.