The authors would like to make the following corrections: in Section 1. Introduction (Page 1. Line 6), should be changed into ; in the same section (Page 1, Line 12), should be changed into .

Also, in Section 2.1. Reagents (Page 2, Line 11), potassium tetraphenylborate (KTPB) should be changed into sodium tetraphenylborate (NaTPB); in Section 2.8. Analysis of Pharmaceutical Samples (Page 2, Line 7), KTPB should be changed into NaTPB.