function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Abadjiev, Stanislav & Langourov, Mario', 5],
    ['Aistleitner, E.', 20],
    ['Bonelli, Simona & Barbero, Francesca & Casacci, Luca Pietro', 16],
    ['Dalman, J. W.', 1],
    ['Evenhuis, Neal L. & O’Hara, James E. & Pape, Thomas', 1],
    ['Franeta, Filip', 4],
    ['Makhov, I. A. & Lukhtanov, V. A. & Matov, A. Yu.', 1],
    ['Vеrоvnik, Rudi', 2],
    ['Zahiri, Reza & Nazari, Vazrick & Rajaei, Hossein', 7]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=57)',
    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);