function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alekseev, Vitalii I. & Drotikova, Anna M. & Rozhina, Viktoria I.', 1],
    ['Danilevsky, Mikhail L.', 1],
    ['Danilevsky, Mikhail L. & Navrátil, D.', 1],
    ['Georgiev, Georgi & Sakalian, Vladimir & Mirchev, Plamen', 1],
    ['Ilić, Nastas & Ćurčić, Srećko', 1],
    ['Kadyrov, Abdysalom Kh. & Karpinski, Lech', 1],
    ['Karpinski, Lech & Szczepanski, Wojciech T.', 1],
    ['Karpinski, Lech & Szczepanski, Wojciech T. & lewa, Radoslaw', 4],
    ['Karpiński, Lech & Enkhnasan, Davaadorj & Boldgiv, Bazartseren', 1],
    ['Lazarev, Maxim A.', 3],
    ['Rapuzzi, Pierpaolo', 1],
    ['Schedl, W.', 5],
    ['Slama, M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=22)',
    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);