function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cadle, John E.', 1],
    ['Delfino, Massimo & Bailon, Salvador & Pitruzzella, Gaetano', 1],
    ['Elmberg, Johan', 1],
    ['Ivanov, Martin', 1],
    ['Ivanov, Martin & Böhme, Madelaine', 2],
    ['Ivanov, Martin & Čerňanský, Andrej & Bonilla-Salomón, Isaac', 1],
    ['Jablonski, Daniel & Khalili, Faizurrahman & Masroor, Rafaqat', 1],
    ['Laurenti, Joseph Nicolas', 4],
    ['Oskyrko, Oleksandra & Jablonski, Daniel', 2],
    ['Rage, Jean-Claude & Bailon, Salvador', 3],
    ['Syromyatnikova, Elena & Tesakov, Alexey & Mayda, Serdar', 1],
    ['Vasilyan, Davit & Cernansky, Andrej & Szyndlar, Zbigniew', 1],
    ['Venczel, Márton & Stiuc, Emanoil', 1],
    ['Wagler, Johann Georg', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);