Table 2. Distribution of the number of authors in documents on psoriasis research indexed in Medline.

Decade	N docs with 1 author	%	N docs with 2–5 authors	%	N docs with 6–9 authors	%	N docs with ≥10 authors	%
1942–1953	316	68.84	143	31.15	0	0.00	0	0.00
1954–1963	571	53.36	495	46.26	4	0.37	0	0.00
1964–1973	1,171	40.43	1,695	58.53	26	0.90	4	0.14
1974–1983	1,228	29.11	2,763	65.49	220	5.22	8	0.19
1984–1993	901	18.47	3,339	68.46	587	12.04	50	1.02
1994–2003	726	14.25	3,100	60.83	1,059	20.78	211	4.14
2004–2013	955	9.50	5,474	54.45	2,591	25.77	1,033	10.28
TOTAL	5,868	20.47	17,009	59.33	4,487	15.65	1,306	4.55