function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bitusik, Peter & Novikmec, Milan & Hamerlik, Ladislav', 1],
    ['Chamutiová, Tímea & Hamerlík, Ladislav & Bitušík, Peter', 3],
    ['Chertoprud, Mikhail V. & Palatov, Dmitry M.', 1],
    ['Giłka, Wojciech & Dobosz, Roland', 1],
    ['Giłka, Wojciech & Gadawski, Piotr', 3],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 1],
    ['Li, Zhiqiang & Tang, Hongqu', 2],
    ['Tasdemir, Ayse & Akyildiz, Gurcay Kivanc', 6],
    ['Telfer, Angela C & Young, Monica R & Quinn, Jenna & Perez, Kate', 5],
    ['Trivinho-Strixino, Susana', 2],
    ['Trivinho-Strixino, Susana & Shimabukuro, Erika Mayumi', 1],
    ['Wang, Xinhua & Guo, Yuhong', 8],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=35)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);