Attempts to present the theoretical background of the subject and use it as justification for the clinical techniques described. Also included in this book is an examination of the backgroundAttempts to present the theoretical background of the subject and use it as justification for the clinical techniques described. Also included in this book is an examination of the backgroundAttempts to present the theoretical background of the subject and use it as justification for the clinical techniques described. Also included in this book is an examination of the background