Nielsen M, Jorgensen J
Contact Dermatitis. 1987 May;16(5):275-6. doi: 10.1111/j.1600-0536.1987.tb01452.x.
33 patients positive to ethylenediamine in 1974 or 1975 were recalled for re-patch testing in 1984/85. 22 answered the letter and 16 came for retesting, of whom approximately 25% now had a negative patch test.
1974年或1975年对乙二胺呈阳性反应的33名患者在1984/85年被召回重新进行斑贴试验。22人回复了信件，16人前来重新检测，其中约25%的人现在斑贴试验呈阴性。
