Abstract

References
1.
Barnett
E
Nordin
B E C
. (1960 ) Clin. Radiol.
11 , 166 .
2.
Barnett
E
Nordin
B E C
. (1961 ) Brit. J. Radiol.
34 , 683 .
3.
By
Waters
E G L
. (1948 ) Clin. Sci.
6 , 281 .
4.
Cameron
J R
Sorenson
J
. (1963 ) Science
142 , 230 .
5.
Doyle
F H
. (1961 ) Brit. J. Radiol.
34 , 698 .
6.
Henny
G C
. (1950 ) Radiology
54 , 202 .
7.
Heuck
F
Schmidt
E
. (1960 ) Fortschr. Rontgenstr.
93 , 523 .
8.
Hodge
H C
Van Huysen
G
Warren
S L
. (1935 ) Amer. J. Roentgenol.
34 , 523 .
9.
Jacobson
B
. (1964 ) Amer. J. Roentgenol.
91 , 202 .
10.
Keane
B E
Spiegler
G
Davis
R
. (1959 ) Brit. J. Radiol.
32 , 162 .
11.
Krokowski
E
. (1959 ) Fortschr. Rontgenstr.
91 , 76 .
12.
MacK
P B
Brown
N N
Trapp
H D
. (1949 ) Amer. J. Roentgenol.
61 , 808 .
13.
Mazess
R B
Cameron
J R
O'Connor
R
Knutsen
D
. (1964 ) Science
145 , 388 .
14.
Meema
H E
. (1963 ) Amer. J. Roentgenol.
89 , 1287 .
15.
Meema
H E
Harries
C K
Parrett
B A
. (1964 ) Radiology
82 , 986 .
16.
Oeser
H
Krokowski
E
. (1963 ) Brit. J. Radiol.
36 , 274 .
17.
Omnell
K A
. (1957 ) Acta radiol., Stockh. Suppl.
148 .
18.
Papworth
M P
. (1964 ) J. Coll. Radiol. Aust.
8 , 78 .
19.
Reich
S B
Levitin
J
Felton
LR
. (1958 ) Amer. J. Roentgenol.
79 , 705 .
20.
Rich
C
Klink
E J
Mullins
G L
Graham
C B
. (1963 ) J. clin. Invest.
42 , 970 .
21.
Sorenson
J A
Cameron
J R
. (1965 ) (in press).
22.
Stein
I
. (1937 ) Amer. J. Roentgenol.
37 , 678 .
23.
Virtama
P
Mähönen
H
. (1960 ) Brit. J. Radiol.
33 , 60 .
24.
Vose
G P
. (1958 ) Radiology
71 , 96 .
