Retraction Note: Novel magnetic organic–inorganic hybrids based on aromatic polyamides and ZnFe2O4 nanoparticles with biological activity - Reza Eivazzadeh-Keihan; Mostafa Ghafori Gorab; Hooman Aghamirza Moghim Aliabadi; Mohammad mahdavi; Ali Reza Akbarzadeh; Ali Maleki; Hossein Ghafuri (Scientific Reports)