Pharmacy (technical language) ; Gesprächsstruktur; Preference organization (conversational analysis) ; Adjacency pairs (conversational analysis) ; Sequence organization (conversational analysis) ; Dialog structure ; Institutional communication ; Physician-patient communication; Doctor-patient-communication ; Helpline; Support; Counselling (communication situation) ; AIDS; HIV ; Südafrika (engl. Sprache in) ; South Africa (English language in) ; English in South Africa