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Maki SAITOU (齊藤真紀) is two persons:

齊藤真紀 = さいとうまき = SAITOU Maki (seiyuu; Wikipedia page, website)
齊藤真紀 - Aishiteruze Baby (TV) as Aki Kagami ; Kiyoko Sasano (referenced at her Wikipedia page)
齊藤真紀 - Ginyuu Mokushiroku Meine Liebe wieder (TV) as Nina (referenced at her Wikipedia page)
齊藤真紀 - Good Morning Call (OAV) as Marina Konno (referenced at her Wikipedia page)
齊藤真紀 - Meine Liebe (TV) as Elaine (referenced at her Wikipedia page)
齊藤真紀 - (The) Place Promised in Our Early Days (movie) as Female student; Nurse (referenced at her Wikipedia page)
齊藤真紀 - Yu-Gi-Oh! Duel Monsters (TV) as Anzu Masaki (second) (referenced at her Wikipedia page)
齊藤真紀 - Yu-Gi-Oh!: The Movie (U.S.) as Anzu Masaki (referenced at her Wikipedia page)
This is the owner of the current entry.

斉藤麻記 = Saitou/Saitoku/Satoiu/Maeda Maki (artist; only valid reading for 麻記 according to EDICT; dozens of 斉藤 at ANN all of which are Saito/Saitou)
斉藤麻記 - Bakemonogatari (TV) : Color Key (livedoor wiki)
斉藤麻記 - Blood+ (TV) : Color Check, Color setting (http://blog.livedoor.jp/jean4/archives/50174051.html)
斉藤麻記 - Death Note (TV) : Color Key (D2_STATION)
???????? - Girls Bravo (TV) : Digital Paint, Finish Check (not backed up by D2_STATION source given at ANN, no Google hit for this combination)
斉藤麻記 - Gurren Lagann (TV) : Finish Animation (D2_STATION)
斉藤麻記 - Suzuka (TV) : デジタルペイント (D2_STATION)
斉藤麻紀 - ToHeart - Remember my memories (TV) : ペイント (shirayuki)
斉藤麻紀 - Ultra Maniac (TV) : Inspection (shirayuki)
This is a different person that needs to be split off. (There are lots of other animes she's not yet credited for at ANN.)