1953 
Lower 
sub- 
pec- 
tor- 
al 
ne¬ 
ar¬ 
er 
sec¬ 
ond 
pec¬ 
toris 
al 
spot 
than 
up¬ 
per 
sub- 
pec- 
tor- 
al. 
ben- 
soni 
