Similar to Dr Morgan and Health Care Medical Clinic in Chiang Mai but for Bangkok is Dr Donna Robinson, a British doctor, GP and qualified in Thailand. She also has close relationships with Bumungrad Hospital, indeed worked or works there but is very busy running her own health centre in Bangkok - Thonglor area. It is called MedConsult Clinic. https://www.medconsultasia.com/ Be sure to use only this e-mail address
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Be sure to use only this e-mail address customer@medconsultasia.com. It appears that Donna has been having issues with the others. Full contact details are here
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Good luck in sorting.