Question: What item was used by Mariana Kovacevic to heal the football striker Asamoah Gyan during the 2012 African Cup of Nations?

<P0-S0> Asamoah Gyan ( , , born 22 November 1985 in Accra) is a Ghanaian professional footballer who plays as a striker for Kayserispor and captains the Ghanaian national team. <SEP> <P1-S0> Mariana Kovacevic is a Serbian traditional healer who has specialized in the use of horse placenta treatment to heal athletes. <P1-S1>  During the duration of the 2012 African Cup of Nations in Gabon and Equatorial Guinea she used the horse placenta treatment to heal Ghana's Asamoah Gyan, who had been injured and was supposed to be off football for four weeks. <P1-S2>  She is reported to have nursed him back to health in four hours. <P1-S3>  She was also reportedly enlisted by the Serbia during the world of 2010 in south Africa. <P1-S4>  Other footballers who are reported to have been treated by Mariana include Pablo Zabaleta, Vincent Kompany, Nigel de Jong and Robin Van Persie of Manchester United. <P1-S5>  There has been some doubt as to whether Mariana's therapies work. <P1-S6>  But more footballers are turning to her for help. <SEP> <P2-S0> James Soto Roberts ( born 10 January 1992), commonly known as Soto, is a Liberian international footballer who plays as a striker for The Lions FC in the Seychelles League. <P2-S1>  In July 2014, he moved from Liberian club LPRC Oilers to The Lions Fc in the Seychelles League. <P2-S2>  Soto scored 6 goals in 12 appearances for The Lions FC during the 2014-2015 Season, winning the MVP during the 2008/2009 season in the Liberian Premier League with the Liberia Black Star FC including 2 Championship with Liberia Black Star and LPRC Oilers. <P2-S3>  Soto represented Liberia Under 23 Team in the 2011 WAFU Nations Cup and was also call up to the Liberia national football team in the 2011/2012 African Cup of Nations. <P2-S4>  qualifier. <SEP> <P3-S0> USM Alger whose team has regularly taken part in Confederation of African Football (CAF) competitions. <P3-S1>  Qualification for Algerian clubs is determined by a team's performance in its domestic league and cup competitions, USM Alger have regularly qualified for the primary African competition, the African Cup, by winning the Ligue Professionnelle 1. <P3-S2>  USM Alger have also achieved African qualification via the Algerian Cup and have played in both the former African Cup Winners' Cup and the CAF Cup. <P3-S3>  the first match was against CARA Brazzaville and ended in victory for USM Alger 2–0 As for the biggest win result was in 2004 against ASFA Yennenga 8–1, and biggest loss firstly defeat in 1998 against Primeiro de Agosto club, and the secondly in 2013 away at against US Bitam 3–0, first participation in International competition were in the African Cup Winners' Cup in 1982 and the maximum in the quarter-finals against Ghanaian club Hearts of Oak, in the 1989 version of the same competition and the club withdrew from the same role after the loss in the first leg against Malagasy club BFV at Omar Hamadi Stadium, after that to miss the club's continental competitions for eight years until 1997 in the CAF Champions League for the first time, The beginning was against CD Travadores from the Cape Verde and ended with score 9–2 in total after the second round faced Udoji United Nigerian club and ended with a total of 3–2 to qualify the team for the group stage, where he signed with Raja Casablanca from Morocco, Primeiro de Agosto from Angola and recently Orlando Pirates of South Africa and the team finished second with 11 points, three victories, two draws and a single defeat was against Primeiro de Agosto score 1–2 away from home, and almost USM Alger advance to the final match and goal difference in favor of Raja Casablanca. <P3-S4>  the following year in the Cup Winners' Cup USMA eliminated in the quarter-final against Angola's Primeiro de Agosto 1–5 on aggregate and before the piece in the second round faced Ghapoha Readers Ghanaian club finished 2–0 on aggregate. <P3-S5>  then he participated in the CAF Cup for the first and last time the first match was against Horoya AC and ended in favor of the Union by away goals rule. <P3-S6>  later in the second round and faced Al-Ahli Wad Madani from Sudan, where they won back and forth a total of 7–0 to stop the march of the team in the quarter-final against Wydad Casablanca by away goals rule one more time.