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Sjaastad O, de Souza Carvalho D, Zhao JM.Sjaastad O, et al. Among authors: de souza carvalho d.Cephalalgia. 1988 Jun;8(2):121-6. doi: 10.1046/j.1468-2982.1988.0802121.x.Cephalalgia. 1988.PMID: 3401914
Sjaastad O, de Souza Carvalho D, Fragoso YD.Sjaastad O, et al. Among authors: de souza carvalho d.Cephalalgia. 1988 Jun;8(2):61-5. doi: 10.1046/j.1468-2982.1988.0802061.x.Cephalalgia. 1988.PMID: 3401917No abstract available.
Sjaastad O, de Souza Carvalho D, Fragoso YD, Zhao JM.Sjaastad O, et al. Among authors: de souza carvalho d.Cephalalgia. 1988 Dec;8(4):285-91. doi: 10.1046/j.1468-2982.1988.0804285.x.Cephalalgia. 1988.PMID: 3219730
Sjaastad O, Saunte C, Fredriksen TA, de Souza Carvalho D, Fragoso YD, Dale LG, Hørven I.Sjaastad O, et al.Cephalalgia. 1988 Jun;8(2):111-20. doi: 10.1046/j.1468-2982.1988.0802111.x.Cephalalgia. 1988.PMID: 3401913