function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alqahtani, Abdulaziz R. & Yagmur, Ersen Aydin & Badry, Ahmed', 1],
    ['D. MORITZ WAGNER', 3],
    ['Hemprich, F. G. & Ehrenberg, Christian Gottfried', 5],
    ['Kovařík, František & Ahmed, Zubair', 5],
    ['Navidpour, Shahrokh & Fet, Victor & Kovařík, František', 1],
    ['Navidpour, Shahrokh & Kovařík, František & Soleglad, Michael E.', 1],
    ['Navidpour, Shahrokh & Soleglad, Michael E. & Fet, Victor', 1],
    ['Siyam, Manal & Dunlop, Jason A. & Kovarik, Frantisek', 1],
    ['Sousa, Pedro & Arnedo, Miquel A. & Harris, D. James', 1],
    ['Teruel, Rolando & Kovařík, František', 4],
    ['Teruel, Rolando & Kovařík, František & Turiel, Carlos', 1],
    ['Vignoli, Valerio & Kovařík, František & Crucitti, Pierangelo', 1],
    ['Yağmur, Ersen Aydın', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    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);