Abstract

References
1.
Feizi T.
(1967 ) British Medical Journal i , 457 –460
2.
Goldblatt M.
, &
Kremin B.J.
(1978 ) Clinical Radiology 29 , 669
3.
Hernandez I.A.
,
Urquhart G.E.D.
, &
Dick W.C.
(1977 ) British Medical Journal ii , 14 –18
4.
Hildenbrandt H.M.
, &
Maassab H.F.
(1966 ) New England Journal of Medicine 274 , 1428 –1430
5.
Jones M.C.
(1970 ) Thorax 25 , 748 –750
6.
Murray H W.
(1975 ) American Journal of Medicine 58 , 229 –242
7.
Ogra P.L.
, &
Herd J.K.
(1971 ) Journal of Immunology 107 , 810 –813
8.
Sharp J.T.
(1970 ) Arthritis and Rheumatism 13 , 263 –271
9.
Wieber R.E.
,
Stokes J.
, &
Buynak
(1969 ) New England Journal of Medicine 280 , 682 –685
