Thank you for this wonderful very clear video , one of the best videos i saw , consise and to the point , thanks . I was taught that 5 cm is not the normal , 1-3 cm is normal , and usualy patients are 2 cm , , male : apical is 1 , middle is 2cm , lower is 2 cm, , femal is 2cm for all bcuz of there wide chest and tissue
