function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Anlaş, S.', 1],
    ['Assing, V.', 3],
    ['Assing, Volker', 6],
    ['Assing, Volker & Schülke, Michael & Brachat, Volker', 1],
    ['Bordoni, A.', 1],
    ['Bordoni, Arnaldo', 1],
    ['Khachikov, E. A.', 2],
    ['Majka, Christopher & Klimaszewski, Jan', 1],
    ['Navarrete-Heredia, José Luis & Gómez-Rodríguez, Cecilia', 1],
    ['Swezey, O. H.', 1],
    ['Türkmen, Senem Özdemir & Şimşek, Burcu Şabanoğlu & Sert, Osman', 1],
    ['V, Alexey & V, Alexander & Barševskis, Arvids', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);