1. Barker JNWN, Barber R, Clough RL, Rosbotham J, Jones A, Terwilliger J, Lathrop M, Trembath RC (1996) Linkage disequilibrium disease gene mapping in psoriasis using a haplo- type relative risk approach. Br J Dermatol 135: 825
2. Botta A, Semprini S, Nudo M, Gennarelli M, Vultaggio P, Novelli G, Fabrizi G, Dallapiccola B (1996) Lack of evidence for a psoriasis susceptibility gene on chromosome 17 in ten three-generations Italian families. Br J Dermatol 135: 838
3. Burch PRJ, Rowell NR (1965) Psoriasis: Aetiological aspects. Acta Derm Venereol 45: 366–380
4. Burden AD, Javed S, Hodgins M, Arngrimsson R, Connor M, Tillman DM (1996) Linkage to chromosome 6p and exclusion of chromosome 17q in familial psoriasis in Scotland. Br J Dermatol 135: 827
5. Farber EM, Bright RD, Nail ML (1968) Psoriasis. A ques¬tionnaire survey of 2144 patients. Arch Dermatol 98: 248–259