Table 1 Characteristics of the reviewed studies of symptomatic recovery.

Year	Setting	Agent	Subjects at follow‐up	Follow‐up (months)	Country	Reference
1977	Clinic	Flour	168	Not available	Europe	Meyer4
1977	Clinic	Red cedar	38	18	Canada	Chan‐Yeung5
1982	Clinic	Colophony	20	29	Europe	Burge6
1982	Clinic	Red cedar	75	42	Canada	Chan‐Yeung7
1984	Clinic	Isocyanates	12	25	Europe	Paggiaro8
1985	Clinic	Various	32	25	Canada	Hudson9
1985	Clinic	Crab	31	12	Canada	Hudson9
1987	Clinic	Isocyanates	50	48	Europe	Lozewicz10
1987	Clinic	Red cedar	136	48	Canada	Chan‐Yeung11
1987	Clinic	Isocyanates	20	30	Europe	Rosenberg12
1988	Clinic	Isocyanates	30	10	Europe	Mapp13
1988	Clinic	Red cedar	17	47	Canada	Chan‐Yeung14
1989	Clinic	Various	32	28	Canada	Allard15
1989	Clinic	Various	28	70	Canada	Allard15
1989	Workplace	Aluminium	43	60	New Zealand	O'Donnell16
1992	Workplace	Aluminium	12	23	Europe	Soyseth17
1992	Clinic	Isocyanates	6	6	Europe	Saetta18
1993	Clinic	Isocyanates	43	60	Europe	Pisati19
1993	Clinic	Various	18	14	Europe	Moscato20
1993	Clinic	Red cedar	80	57	Canada	Marabini21
1994	Clinic	Isocyanates	28	82	Europe	Marabini22
1994	Clinic	Cobalt	8	36	Europe	Pisati23
1994	Workplace	Platinum salts	24	19	Europe	Merget24
1995	Clinic	Isocyanates	10	13	Europe	Saetta25
1995	Workplace	Anhydrides	6	12	USA	Grammer26
1996	Clinic	Various	32	18	Canada	Malo27
1996	Clinic	Various	15	40	Canada	Lemiere28
1996	Workplace	Anhydrides	11	48	USA	Grammer29
1997	Clinic	Isocyanates	35	24	Korea	Park30
1998	Clinic	Various	55	31	USA	Gassert31
1998	Clinic	Various	305	Not available	Europe	Ross32
1998	Clinic	Enzymes	3	Not available	Europe	Sen33
1998	Workplace	Anhydrides	6	240	Europe	Barker34
1999	Clinic	Various	13	12	Europe	Moscato35
2002	Clinic	Latex	16	56	Europe	Vandenplas36
2002	Clinic	Isocyanates	41	67	Korea	Park37
2003	Clinic	Persulphate	5	23	Europe	Munoz38
2003	Clinic	Isocyanates	74	132	Europe	Padoan39
2004	Clinic	Various	103	104	Canada	Maghni40