title: In favor of double testing.
authors.forename: A W
authors.initials: AW
authors.lastname: Klein
mesh_terms: D003094:Collagen / Q000009:adverse effects; D062109:Dermatologic Surgical Procedures; D006801:Humans; D019736:Prostheses and Implants / Q000009:adverse effects; D012882:Skin Tests / Q000379:methods*
chemical_list: D003094:Collagen