I understand the rule to capitalize a profession (i.e. job title) when it is precedes a name, as in President John Doe... but what if we are talking about titles in general. I am working on a document that discusses when to request a referral to Registered Dietitian, Occupational Therapist or Speech Language Pathologist. Should these all be lower case, or capitalized? 

Example: Feeding therapists are often Speech Language Pathologists, Occupational Therapists or Registered Dietitians and can be referred to using [blank] form.