_:vb50955857 . _:vb50955857 "url:http://www2.merriam-webster.com/cgi-bin/mwmednlm?book=Medical&va=ulcer"^^ . _:vb50955857 . _:vb50955857 "Ulcer of lower limbs is a chronic ulcer of skin where the ulcer is not a decubitus ulcer."^^ . _:vb50955857 . _:vb50955857 . _:vb50955857 .