function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Beier, Max', 2],
    ['Gogshelidze, Mariam & Novak, Janos', 2],
    ['Hernández-Corral, Jesús & Zaragoza, Juan A. & Micó, Estefanía', 1],
    ['Hoff, C. Clayton', 1],
    ['Hoff, C. Clayton & Clawson, David L.', 1],
    ['Mahnert, Volker & Iorio, Osvaldo Di & Turienzo, Paola', 1],
    ['Novák, János', 2],
    ['Redikorzev, V.', 1],
    ['Ćurčić, B. P. M.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);