function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barševskis, Arvīds & Janovska, Marina & Aksjuta, Kristīna', 2],
    ['Brullé, Auguste', 1],
    ['Creutzer, Christian', 1],
    ['Fabricius, Johann Christian', 1],
    ['Fuessly, Johann Caspar', 1],
    ['Ghahari, Hassan & Háva, Jiří & R, Aclypea & M, Dendroxena', 2],
    ['Linnaeus, Carolus', 28],
    ['Ménétries, E.', 3],
    ['Nishikawa, Masaaki & Ikeda, Hiroshi & Kubota, Kohei', 4],
    ['Piller, Mathias & Mitterpacher, Ludovico', 1],
    ['Ruchin, Alexaner B. & Egorov, Leonid V. & Alekseev, Sergei K.', 2],
    ['Çiftçi, Derya & Růžička, Jan & Hasbenli, Abdullah & Şahin, Ülfet', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=50)',
    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);