Hi Rach,
As indicated by Annie, Pr Eymard is well known (at least in France) for his skills in MG therapies.
Also as a complement, hereunder is an adress with telephone number and e-mail you could try to investigate your chances in getting opinion or advise from them:

CONSULTATION Adultes (75) **
Responsable : Pr Bertrand FONTAINE (Neurologue)
Adresse : GH Pitié Salpêtrière
Fédération de Neurologie
Bât. Castaigne
47-83 Boulevard de l'Hôpital
75013 PARIS Cedex 13
Tél. : 01 42 16 17 94
bertrand.fontaine@psl.ap-hop-paris.fr

** Centre de référence labellisé

Good luck!
Maurice.