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multiple names:
authors list (link)
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Timmenga NM,
Reintsema H,
Stegenga B,
Vissink A (June 2001). "Maxillary...
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Henny J. A.;
Raghoebar,
Gerry M.; Vissink,
Arjan (May 2006). "Implant-retained
mandibular overdentures...
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Filius MA, Cune MS,
Raghoebar GM,
Vissink A,
Visser A (May 2016). "Prosthetic
treatment outcome in patients...