Description of measures allowing reducing the bias factor Randomization Randomization at phase 2 shall be performed using the WinPepi statistical program, option Masking Partial masking shall be used. Assessment of endoscopic examination at week 8 of treatment shall be blinded; the specialist conducting endoscopy shall not know which therapy was used. Statistical analysis shall be performed after coding of subjects; and during analysis it shall not be known which of the groups is receiving Omez-DSR, and which one - Omez.