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Mombelli A, Lang NP.Mombelli A, et al. Among authors: lang np.Clin Oral Implants Res. 1992 Dec;3(4):162-8. doi: 10.1034/j.1600-0501.1992.030402.x.Clin Oral Implants Res. 1992.PMID: 1298430
Lehmann B, Bragger U, Hammerle CH, Fourmousis I, Lang NP.Lehmann B, et al. Among authors: lang np.Clin Oral Implants Res. 1992 Mar;3(1):42-8. doi: 10.1034/j.1600-0501.1992.030107.x.Clin Oral Implants Res. 1992.PMID: 1420726
Siegrist BE, Brecx MC, Gusberti FA, Joss A, Lang NP.Siegrist BE, et al. Among authors: lang np.Clin Oral Implants Res. 1991 Jan-Mar;2(1):38-46. doi: 10.1034/j.1600-0501.1991.020105.x.Clin Oral Implants Res. 1991.PMID: 1807421
Hämmerle CH, Wagner D, Brägger U, Lussi A, Karayiannis A, Joss A, Lang NP.Hämmerle CH, et al. Among authors: lang np.Clin Oral Implants Res. 1995 Jun;6(2):83-90. doi: 10.1034/j.1600-0501.1995.060203.x.Clin Oral Implants Res. 1995.PMID: 7578785