Start a marketing risk register

I work in marketing at a private health clinic. Help me start a simple risk register for our marketing.

Context: The common failures are an unapproved post, a before and after photo without consent, a review reply that confirms a patient and a price that is out of date.

Before you start, ask me for anything missing from this list:
- The channels we use
- Who approves what today
- Anything that has gone wrong before

Then:
1. List what could go wrong on each channel.
2. Rate each by likelihood and harm.
3. Name an owner and a check for each.

Give me:
- A table of risk, likelihood, harm, owner and check
- The three to deal with first

Rules:
- Use only the facts I give you. Where something is missing, write [detail needed]. Never invent a number, a name, a quote or a source.
- Give general health information only. Never write anything that reads as advice on a person's own condition, and never suggest a treatment is certain to work or free of risk.
- Write in plain English, in our voice if I have given you a sample.
- Do not tell me what the rules or regulations say. If something may be restricted, flag it and I will check.

Finish with a list headed "Check before this goes out". Include these, plus anything else our clinical lead or the registered manager who approves marketing should see:
- Who approves each channel today
- Where patient consents and approvals are recorded
- Staff posting about patients or treatments from personal accounts