function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ishikawa, Tadashi & Saito, Masayuki U. & Kishimoto-Yamada, Keiko', 2],
    ['Kment, Petr & Rédei, Dávid & Rider, David', 3],
    ['Kment, Petr & Salini, S. & Ahmed, Zubair', 1],
    ['Laterza, Ilaria & Tamburini, Giovanni & Panzarino, Onofrio', 1],
    ['Mayr, G. L.', 1],
    ['Rider, David A. & Swanson, Daniel R.', 2],
    ['Vétek, Gábor & Papp, Veronika & Haltrich, Attila & Rédei, Dávid', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 1],
    ['Çerçi, Bariş & Karataş, Ahmet & Karataş, Ayşegül', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);