Dear @Ant,
I did some research here is what I found out:
Dres. Sonja Luig und Maria Christodoulou
Allee 15
59439 Holzwickede
Nordrhein-Westfalen
Deutschland
Telefon:02301/8618
Fax:02301/8619
Dr. Maleszka
Gladbecker Straße 269 - 271
45326 Essen
Telefon: 0201/ 83 25 550
Fax: 0201/ 83 25 551
Bocholder Straße 181-183
45355 Essen
Telefon: 0201/ 68 14 43
Fax: 0201/ 67 32 08
E-Mail: info@kinderarztpraxis-maleszka.de
These are greek ones but not in Düsseldorf directly. In Düsseldorf I could not find one that speaks greek.
I hope this can help you and your child. If you need further guidance please feel free to reach out to us in the community.
Best regards,
Nilab