But he says he cannot be sure why Mariam Khatib died until the samples are analysed.
Heading the delegation is Mouaz al-Khatib, the Coalition said in a statement on its Facebook page.
He declined to discuss any issues inside the Coalition that could have influenced al-Khatib's decision.
It gave no details and al-Khatib and Lavrov did not immediately respond to requests for comments.
What began as a temporary assignment turned into a six-year gig, with Mr. El Khatib becoming creative director.
WSJ: Songs as Catchy as Advertised | Hanni El Khatib | By Jim Fusilli
Several songs kick off with Mr. El-Khatib's fuzzy guitar as if to present the foundation in stark relief.
WSJ: Songs as Catchy as Advertised | Hanni El Khatib | By Jim Fusilli
But on Monday evening, Mr al-Khatib said in a Facebook post that his group would fly to Italy.
Egashira N, Iwasaki K, Akiyoshi Y, Takagaki Y, Hatip-Al-Khatib I, Mishima K, Kurauchi K, Ikeda T, Fujiwara M.
Al-Khatib found that many patients who were being implanted with the ICDs had recently experienced arrhythmias or cardiac arrests.
Mouaz al-Khatib cited frustration over what he called lack of international support and constraints imposed by the body itself.
Al-Khatib's spokesman, Ali Mohammed Ali, confirmed the authenticity of the statement in a phone call with The Associated Press.
In the last two months, various members of the coalition, including its head, Mouaz al-Khatib, have visited these areas.
In December, Russia invited al-Khatib to peace talks in Moscow or another location.
Jordan's foreign minister, Abdulilah Khatib, peddled the proposal in Jerusalem this week, but predictably got short shrift from Mr Sharon.
Recent evidence of this potential can be seen in the unlikely breakthrough for Firas Khatib, from the University of Washington.
Moaz al-Khatib, the Syrian opposition leader, appeared underwhelmed by the US shift.
"The scope for public expression has become much wider" said Lina Khatib, director of the Arab Reform and Democracy Program at Stanford University.
Mr Khatib, who was elected head of the National Coalition in November 2012, is seen as a respected and unifying figure in Syria.
And I recounted my meetings on Saturday in Germany with President al-Khatib, as well as a long meeting I had with the U.N.
Syrian opposition coalition President Moaz al-Khatib said Thursday that the rebels took the peacekeepers for their own safety due to fighting there.
Every now and then, it will occur to Mr. El Khatib that his bet paid off and his career in music is working out.
WSJ: Songs as Catchy as Advertised | Hanni El Khatib | By Jim Fusilli
Mr Khatib, who heads the National Coalition, has seen his surprise offer of peace talks backed by the US, UN and the Arab League.
He said that his Special Envoy, Abdul Ilah al-Khatib, would return to Libya shortly, to meet both with leaders of the Government and the opposition.
Mr Khatib's resignation comes a day after European Union foreign ministers failed to resolve their differences over whether to exempt Syrian rebels from an arms embargo.
Mr Khatib may have feared that Mr Hitto's election would further distance the outside opposition leadership from what is going on inside Syria, our correspondent says.
Secretary of State John Kerry said he was sorry to learn of al-Khatib's resignation, but that it won't affect U.S. cooperation with the Coalition on aid.
The newly appointed American diplomat spoke on the phone Monday with al-Khatib and encouraged him to attend the Rome conference, said a senior State Department official.
Even with the current guidelines, Al-Khatib said, some patients may fall into a gray zone and that each physician needs to use clinical judgment to make recommendations.
Mr Khatib held talks in Munich over the weekend with Iranian Foreign Minister Ali Akhbar Salehi and Sergei Lavrov, foreign minister of Syria's other key ally Russia.
Khatib decided to share a longstanding problem in AIDS research in the form of Foldit, a program that reframes scientific challenges as a competitive multiplayer computer game.
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