Impairment of viral replication capacity by <it>nef</it> alleles from HIV elite controllers by Walker Bruce, Pereyra Florencia, Martin Eric, Miura Toshiyuki, Tokunaga Michiyo, Ogata Yoko, Otsuka Hirohito, Markle Tristan, Mwimanzi Philip, Brumme Zabrina, Brockman Mark, Ueno Takamasa