We wish to thank Dr. Bogdan Kaluzewski from the Medical University of Lodz, Poland, and Dr. Ajit S. Gandhi from the Unique Hospital Solapur, India for sending us images and for the right to use them.

We wish to thank Dr. James Huhta from the University of South Florida, and Dr. Maria Respondek-Liberska fom The Polish Mother's Memorial Hospital in Lodz, Poland for their comments and suggestions.